SAMSUNG MC12U256NBYC

MultiMediaCardTM
MultiMediaCard Specification
Version : Ver. 0.9
Date 4 – June - 2004
Samsung Electronics Co., LTD
Semiconductor Flash Memory Product Planning & Applications
1
MultiMediaCardTM
Revision History
Revision
No.
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
History
Draft Date
Remark
1. Initial Draft
November 29th 2001
Preliminary
1.
2.
3.
1.
2.
1.
2.
3.
1.
2.
3.
1.
2.
March 15th 2002
Preliminary
June 21st 2002
Preliminary
November 23rd 2002
Preliminary
April 7th 2003
Advanced
1.
2.
1.
2.
Changed CSD filed
Added Command Response Timing
Added SPI Bus Timing
Added Ordering Information (page 6)
Added Power Consumption (page 13)
Changed CSD field (page 22)
Changed command class (page 30)
Added operating characteristics (page 14)
Changed ordering information (page 6)
Changed memory array structure (page 9)
Change C_SIZE and C_SIZE_MULT(page 26)
Changed CSD information (page 22,23)
Deleted paragraphs regarding stream read and
partial read/write
Added dimensions of RS-MMC
Added product code of RS-MMC
Added product code of MMC using
S3C49M8X01 controller
Added product code of programmable CID
MMC using S3C49M8X01 controller
Changed controller type for all kinds of MMC
0.8
1.
0.9
1. Changed product model
- Changed from “no lead free” to “lead free” for
NAND Flash PKG (page 5,6)
2. Changed CSD Field (page23)
3. Changed ERASE_GRP_SIZE (page27)
April 26th 2003
November 12th 2003
December 2nd 2003
February 16th 2004
June 4th 2004
2
MultiMediaCardTM
1
1.1
1.2
Introduction to the MultiMediaCard ----------------------------------------------------------- 5
System Features ----------------------------------------------------------------------------------------- 5
Product Model -------------------------------------------------------------------------------------- 5
2
2.1
2.2
2.3
2.4
2.5
2.6
2.6.1
2.6.2
2.6.3
2.6.4
2.6.5
2.6.6
2.6.7
2.6.8
2.6.9
2.6.10
2.6.11
2.6.12
2.7
2.7.1
2.7.2
2.7.3
2.7.4
2.7.5
2.7.6
2.7.7
2.7.8
2.7.9
Function Description ------------------------------------------------------------------------------- 7
Flash Technology Independence ------------------------------------------------------------------ 7
Defect and Error Management --------------------------------------------------------------------- 7
Endurance ----------------------------------------------------------------------------------------------- 7
Automatic Sleep Mode ------------------------------------------------------------------------------- 7
Hot Insertion -------------------------------------------------------------------------------------------- 8
MultiMediaCard Mode -------------------------------------------------------------------------------- 8
MultiMediaCard Standard Compliance ----------------------------------------------------------- 8
Negotiation Operation Conditions ----------------------------------------------------------------- 8
Card Acquisition and Identification ---------------------------------------------------------------- 8
Card Status ---------------------------------------------------------------------------------------------- 8
Memory Array Partitioning --------------------------------------------------------------------------- 9
Read and Write Operations ------------------------------------------------------------------------- 9
Data Transfer Rate ------------------------------------------------------------------------------------10
Data Protection in the Flash Card -----------------------------------------------------------------10
Erase -----------------------------------------------------------------------------------------------------10
Write Protection ----------------------------------------------------------------------------------------10
Copy Bit ------------------------------------------------------------------------------------------------- 10
The CSD Register ------------------------------------------------------------------------------------ 11
SPI Mode ----------------------------------------------------------------------------------------------- 11
Negotiating Operation Conditions ---------------------------------------------------------------- 11
Card Acquisition and Identification --------------------------------------------------------------- 11
Card Status --------------------------------------------------------------------------------------------- 11
Memory Array Partitioning -------------------------------------------------------------------------- 11
Read and Write Operations ------------------------------------------------------------------------- 11
Data Transfer Rate ------------------------------------------------------------------------------------ 11
Data Protection in the MultiMediaCard ----------------------------------------------------------- 12
Erase ----------------------------------------------------------------------------------------------------- 12
Write Protection ---------------------------------------------------------------------------------------- 12
3
3.1
3.2
3.3
3.4
3.5
Product Specifications ----------------------------------------------------------------------------- 13
Recommended Operating Conditions ------------------------------------------------------------------------- 13
Operating Characteristis ----------------------------------------------------------------- 14
System Environmental Specifications ----------------------------------------------------------------- 15
System Reliability and Maintenance -------------------------------------------------------------- 15
Physical Specifications ------------------------------------------------------------------------------- 16
4
4.1
4.2
4.3
4.4
4.4.1
4.4.2
4.5
4.5.1
4.5.2
MultiMediaCard Interface Description --------------------------------------------------------- 17
Pin Assignments in MultiMediaCard Mode ------------------------------------------------------- 17
Pin Assignments in SPI Mode ---------------------------------------------------------------------- 18
MultiMediaCard Bus Topology ---------------------------------------------------------------------- 18
SPI Bus Topology -------------------------------------------------------------------------------------------------- 19
SPI Interface Concept ------------------------------------------------------------------------------------------- 19
SPI Bus Topology ------------------------------------------------------------------------------------------------ 19
Registers ------------------------------------------------------------------------------------------------- 20
Operation Condition Register (OCR) ---------------------------------------------------------------------------20
Card Identification (CID) ------------------------------------------------------------------------------21
3
MultiMediaCardTM
4.5.3
4.5.4
4.6
4.6.1
4.7
4.8
4.8.1
4.9
4.9.1
4.9.2
4.9.3
4.9.4
4.9.5
4.9.6
4.9.7
4.9.8
4.9.9
4.10
4.10.1
4.10.2
4.10.3
4.10.4
4.10.5
4.10.6
4.10.7
4.10.8
4.10.9
4.10.10
4.10.11
4.10.12
4.10.13
4.10.14
4.10.15
4.11
4.12
4.12.1
4.12.2
Relative Card Address (RCA) ----------------------------------------------------------------------Card Specific Data (CSD) ---------------------------------------------------------------------------MultiMediaCard Communication -------------------------------------------------------------------Commands ----------------------------------------------------------------------------------------------Read, Write and Erase Time-out Conditions ----------------------------------------------------Card Identification Mode -----------------------------------------------------------------------------Operating Voltage Range Validation --------------------------------------------------------------Data Transfer Mode -----------------------------------------------------------------------------------Block Read ----------------------------------------------------------------------------------------------Block Write ----------------------------------------------------------------------------------------------Erase -----------------------------------------------------------------------------------------------------Write Protect Management -------------------------------------------------------------------------Card Lock/Unlock Operation -----------------------------------------------------------------------Responses ----------------------------------------------------------------------------------------------Status -----------------------------------------------------------------------------------------------------Command Response Timing -----------------------------------------------------------------------Reset -----------------------------------------------------------------------------------------------------SPI Communication ----------------------------------------------------------------------------------Mode Selection ----------------------------------------------------------------------------------------Bus Transfer Protection -----------------------------------------------------------------------------Data Read Overview ---------------------------------------------------------------------------------Data Write Overview ---------------------------------------------------------------------------------Erase and Write Protect Management ----------------------------------------------------------Reading CID/CSD Registers -----------------------------------------------------------------------Reset Sequence --------------------------------------------------------------------------------------Error Conditions ---------------------------------------------------------------------------------------Memory Array Partitioning --------------------------------------------------------------------------Card Lock/Unlock -------------------------------------------------------------------------------------Commands ----------------------------------------------------------------------------------------------Responses ----------------------------------------------------------------------------------------------Data Tokens --------------------------------------------------------------------------------------------Data Error Token --------------------------------------------------------------------------------------Clearing Status Bits -----------------------------------------------------------------------------------SPI Bus Timing ----------------------------------------------------------------------------------------Error Handling -----------------------------------------------------------------------------------------Error Correction Code (ECC) ----------------------------------------------------------------------Cyclic Redundancy Check (CRC) -----------------------------------------------------------------
21
22
30
30
33
34
35
35
37
37
38
38
38
41
42
44
48
49
49
49
50
51
52
53
53
53
53
53
54
56
58
59
60
61
64
64
64
4
MultiMediaCardTM
1 Introduction to the MultiMediaCard
The MultiMediaCard is a universal low cost data storage and communication media. It is designed to
cover a wide area of applications as cellula phone, electronic toys, organizers, PDAs, cameras, smart
phones, digital recorders, MP3 players, pagers, etc. Targeted features are high mobility and high
performance at a low cost price. It might also be expressed in terms of low power consumption and
high data throughput at the memory card interface
The MultiMediaCard communication is based on an advanced 7-pin serial bus designed to operate in a
low voltage range. The communication protocol is defined as a part of this standard and referred to as
MultiMediaCard mode. For compatibility to existing controllers the cards may offer, in addition to the
MultiMediaCard mode, an alternate communication protocol which is based on the SPI standard
1.1 System Features
- MultiMediaCard System Specification Ver.3.31 compatible
- Supports Standard MultiMediaCard bus
- Supports SPI Mode (single and multiple block read and write operations)
- Supports block read/write
- Targeted for portable and stationary applications
- Maximum data rate with up to 10 cards
- Correction of memory field errors
- Built-in write protection features (permanent and temporary)
- Comfortable erase mechanism
- 2.7 to 3.6 volts operation
1.2 Product Model
Table 1-1 MultiMediaCard Capacities (Packing Type:Bulk Type I)
Model Number
Capacities
MC56U032NCFA-0QC00
32MB
MC12U064NBFA-0QC00
64MB
MC1GU128NAFA-0QC00
128MB
MC2DU256NAFA-0QC00
256MB
MC2GU512NMCA-0QC00
512MB
MC2GU01GNMCA-0QC00
1GB
MC56U032HCCA-0QC00
32MB
MC12U064HACA-0QC00
64MB
MC1GU128HACA-0QC00
128MB
MC1GU256HACA-0QC00
256MB
Remarks
. Full Size MMC
. S3F49DAX Controller
. Reduced-Size MMC
(RS-MMC)
. S3F49DAX Controller
5
MultiMediaCardTM
Table 1-2 Ordering Information
M(1) C(2) X(3) X(4) X(5) X(6) X(7) X(8) X(9) X(10) X(11) X(12) –(13) X(14) X(15) X(16) X(17) X(18)
(1) Module : M
(2) Card : C
(3) ~(4) : Flash Density
28 : 128Mb
56 : 256Mb
12 : 512Mb
1G : 1Gb
1D : 1Gb DDP
2D : 2Gb DDP
(5) Feature
U : MultimediaCard
(6) ~ (8) Card Density
016 : 16MB
032 : 32MB
064 : 64MB
128 : 128MB
256 : 256MB
512 : 512MB
(9) Card Type
N : Standard MultiMediaCard
H : Reduced-Size MultiMediaCard
(10) Flash Generation
M : 1st Generation
A : 2nd Generation
B : 3rd Generation
C : 4th Generation
D : 5th Generation
(11) Flash Package
C : CHIP
Y : TSOP 1
V : WSOP
F : WSOP(Lead Free)
(12) PCB Revision
A : None
B : 1st Rev.
C : 2nd Rev.
(13) “ –“
(14) Packing Type
0 : Bulk Type I
1 : Bulk Type II (By White Case)
2 : Bulk Type I (No Label)
3 : Bulk Type II (No Label)
4 : Bulk Type I (Only Back Label)
5 : Bulk Type II (Only Back Label)
(15) Controller
Q : S3F49DAX
(16) Controller Firmware Revision
A : None
B : 1st Rev.
C : 2nd Rev.
D : 3rd Rev.
E : 4th Rev.
(17) ~ (18) Customer Grade
“Customer List Reference”
The performance of the communication channel is described in the table below
MultiMediaCard Mode
Three-wire serial data bus (clock, command,
data)
Up to 64k cards addressable by the bus
protocol
Up to 30 cards stackable on a single physical
bus
Easy identification and assignment of session
address to individual cards in a card stack
Error-protected data transfer
single/multiple block read/write command
SPI Mode
Three-wire serial data bus (clock, dataIn,
dataOut) + card specific CS signal
Card selection via a hardware CS signal
Card stacks require a “per card” CS signal
Not available. Card selection via a hardware
CS signal
Optional. A non protected data transfer mode is
available
Single/multiple block read/write commands
6
MultiMediaCardTM
2 Function Description
2.1 Flash Technology Independence
The 512 byte sector size of the MultiMediaCard is the same as that in an IDE magnetic disk drive. To
write or read a sector (or multiple sectors), the host computer software simply issues a Read or Write
command to the MultiMediaCard. This command contains the address and the number of sectors to
write/read. The host software then waits for the command to complete. The host software does not get
involved in the details of how the flash memory is erased, programmed or read. This is extremely
important as flash devices are expected to get more and more complex in the future. Because the
MultiMediaCard uses an intelligent on-board controller, the host system software will not require
changing as new flash memory evolves. In other words, systems that support the MultiMediaCard
today will be able to access future MultiMediaCards built with new flash technology without having to
update or change host software.
2.2 Defect and Error Management
MultiMediaCards contain a sophisticated defect and error management system. This system is
analogous to the systems found in magnetic disk drives and in many cases offers enhancements. For
instance, disk drives do not typically perform a read after write to confirm the data is written correctly
because of the performance penalty that would be incurred. MultiMediaCards do a read after write
under margin conditions to verify that the data is written correctly (except in the case of a Write without
Erase Command). In the rare case that a bit is found to be defective, MultiMediaCards replace this bad
bit with a spare bit within the sector header. If necessary, MultiMediaCards will even replace the entire
sector with a spare sector. This is completely transparent to the host and does not consume any user
data space.
The MultiMediaCards soft error rate specification is much better than the magnetic disk drive
specification. In the extremely rare case a read error does occur, MultiMediaCards have innovative
algorithms to recover the data. This is similar to using retries on a disk drive but is much more
sophisticated. The last line of defense is to employ powerful ECC to correct the data. If ECC is used to
recover data, defective bits are replaced with spare bits to ensure they do not cause any future
problems.
These defect and error management systems coupled with the solid-state construction give
MultiMediaCards unparalleled reliability
2.3 Endurance
MultiMediaCards have an endurance specification for each sector of 1,000,000 writes (reading a
logical sector is unlimited). This is far beyond what is needed in nearly all applications of
MultiMediaCards. Even very heavy use of the MultiMediaCard in cellular phones, personal
communicators, pagers and voice recorders will use only a fraction of the total endurance over the
typical device’s five year lifetime. For instance, it would take over 100 years to wear out an area on the
MultiMediaCard on which a files of any size (from 512 bytes to capacity) was rewritten 3 times per hour,
8 hours a day, 365 days per year.
With typical applications the endurance limit is not of any practical concern to the vast majority of users.
2.4 Automatic Sleep Mode
7
MultiMediaCardTM
An important feature of the MultiMediaCard is automatic entrance and exit from sleep mode. Upon
completion of an operation, the MultiMediaCard will enter the sleep mode to conserve power if no
further commands are received within 5 msec The host does not have to take any action for this to
occur. In most systems, the MultiMediaCard is in sleep mode except when the host is accessing it,
thus conserving power. When the host is ready to access the MultiMediaCard and it is in sleep mode,
any command issued to the MultiMediaCard will cause it to exit sleep and respond. The host does not
have to issue a reset first. It may do this if desired, but it is not needed. By not issuing the reset,
performance is improved through the reduction of overhead.
2.5 Hot Insertion
Support for hot insertion will be required on the host but will be supported through the connector.
Connector manufacturers will provide connectors that have power pins long enough to be powered
before contact is made with the other pins. Please see connector data sheets for more details. This
approach is similar to that used in PCMCIA to allow for hot insertion. This applies to both
MultiMediaCard and SPI modes.
2.6 MultiMediaCard Mode
2.6.1 MultiMediaCard Standard Compliance
The MultiMediaCard is fully compliant with MultiMediaCard standard specification V3.31.
The structure of the Card Specific Data (CSD) register is compliant with CSD structure V1.2.
2.6.2 Negotiating Operation Conditions
The MultiMediaCard supports the operation condition verification sequence defined in the
MultiMediaCard standard specifications. The MultiMediaCard host should define an operating voltage
range that is not supported by the MultiMediaCard. It will put itself in an inactive state and ignore any
bus communication. The only way to get the card out of the inactive state is by powering it down and
up again. In addition the host can explicitly send the card to the inactive state by using the
GO_INACTIVE_STATE command.
2.6.3 Card Acquisition and Identification
The MultiMediaCard bus is a single master (MultiMediaCard host) and multi-slaves (cards) bus. The
host can query the bus and find out how many cards of which type are currently connected. The
MultiMediaCard’s CID register is pre-programmed with a unique card identification number which is
used during the acquisition and identification procedure
In addition, the MultiMediaCard host can read the card’s CID register using the READ_CID
MultiMediaCard command. The CID register is programmed during the MultiMediaCard testing and
formatting procedure, on the manufacturing floor. The MultiMediaCard host can only read this register
and not write to it.
2.6.4 Card Status
MultiMediaCard status is stored in a 32 bit status register which is sent as the data field in the card
respond to host commands. Status register provides information about the card’s current state and
completion codes for the last host command. The card status can be explicitly read (polled) with the
SEND_STATUS command.
8
MultiMediaCardTM
2.6.5 Memory Array Partitioning
Although the MultiMediaCard memory space is byte addressable with addresses ranging from 0 to the
last byte, it is not a simple byte array but divided into several structures. Memory bytes are grouped
into 512 byte blocks called sectors. Every block can be read, written individually.
Erase group is a number of sectors. Its size is the number of consecutive sectors. Any combination of
erase groups can be erased in a single erase command. A write command implicitly erases the
memory before writing new data into it. Explicit erase command can be used for pre-erasing of memory
to speed up the next write operation.
Write Protect Groups (WPG) is the minimal units that may have individual write protection. Its size is
the number of erase units that will be write protected by on bit. The write/erase access to each WPG
can be limited individually. The number of various memory structures, for the different MultiMediaCards
are summarized in Table 2-1
Table 2-1 Memory Array Structure
Bytes
Sectors
Erase
Group
WPG
32MB
62,720
1,960
64MB
125,440
3,920
128MB
250,880
980
256MB
501,760
1,960
512MB
1,003,520
3,920
1GB
2,007,040
7,840
490
980
245
490
980
1,960
Read and Write Operations
The MultiMediaCard supports two read/write modes.
Single Block Mode
In this mode the host reads or writes one data block in a pre-specified length block transmission is
protected with 16 bit CRC which is generated by the sending unit and checked by the receiving unit.
Misalignment is not allowed. Every data block must be contained in a single memory sector. The block
length for write operations must be identical to the sector size and the start address aligned to a sector
boundary.
Multiple Block Mode
This mode is similar to the single block mode, but the host can read/write multiple data blocks (all have
the same length) which will be stored or retrieved from contiguous memory addresses starting at the
address specified in the command.
The operation is terminated with a stop transmission command. Misalignment and block length
restrictions apply to multiple blocks as well and are identical to the single block read/write operations.
Multiple block read with pre-defined block is supported.
2.6.6 Data Transfer Rate
The average data transfer rate for the MultiMediaCard is 1 Mbyte/sec for read and 300 Kbyte/Sec for
write (erase time is included) at 3.3 Volts. In block mode, where time gaps can be inserted between
data blocks, the maximum clock frequency is 20MHz. The typical access time (latency) for each data
block, in read operation, is 1.5ms. The write block operation is done in handshake mode. The card will
keep data line DAT low as long as the write operation is in progress and there are no write buffers
available
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MultiMediaCardTM
2.6.7 Data Protection in the Flash Card
Every sector is protected with an Error Correction Code (ECC). The ECC is generated (in the memory
card) when the sectors are written and validated when the data is read. If defects are found, the data is
corrected prior to transmission to the host.
The MultiMediaCard can be considered error free and no additional data protection is needed.
However, if an application uses additional, external, ECC protection, the data organization is defined in
the user writeable section of the CSD register
2.6.8 Erase
The smallest erasable unit in the MultiMediaCard is a erase group. In order to speed up the erase
procedure, multiple erase groups can be erased in the same time. The erase operation is divided into
two stages.
Tagging - Selecting the Sectors for Erasing
To facilitate selection, a first command with the starting address is followed by a second command with
the final address, and all erase groups within this range will be selected for erase.
Erasing - Starting the Erase Process
Tagging can address erase groups. An arbitrary selection of erase groups may be erased at one time.
Tagging and erasing must follow a strict command sequence (refer to the MultiMediaCard standard
specification for details).
2.6.9 Write Protection
The MultiMediaCard erase groups are grouped into write protection groups. Commands are provided
for limiting and enabling write and erase privileges for each group individually. The current write protect
map can be read using SEND_WRITE_PROT command.
In addition two, permanent and temporary, card levels write protection options are available.
Both can be set using the PROGRAM_CSD command (see below). The permanent write protect bit,
once set, cannot be cleared.
The One Time Programmable (OTP) characteristic of the permanent write protect bit is implemented in
the MultiMediaCard controller firmware and not with a physical OTP cell.
2.6.10 Copy Bit
The content of an MultiMediaCard can be marked as an original or a copy using the copy bit in the
CSD register. Once the Copy bit is set (marked as a copy) it cannot be cleared.
The Copy bit of the MultiMediaCard is programmed (during test and formatting on the manufacturing
floor) as a copy. The MultiMediaCard can be purchased with the copy bit set (copy) or cleared,
indicating the card is a master.
The One Time Programmable (OTP) characteristic of the Copy bit is implemented in the
MultiMediaCard controller firmware and not with a physical OTP cell.
2.6.11 The CSD Register
All the configuration information of the MultiMediaCard is stored in the CSD register. The MSB bytes of
the register contain manufacturer data and the two least significant bytes contains the host controlled
data - the card Copy and write protection and the user ECC register.
10
MultiMediaCardTM
The host can read the CSD register and alter the host controlled data bytes using the SEND_CSD and
PROGRAM_CSD commands.
2.7 SPI Mode
The SPI mode is a secondary (optional) communication protocol offered for MultiMediaCard. This
mode is a subset of the MultiMediaCard protocol, designed to communicate with an SPI channel,
commonly found in Motorola’s (and lately a few other vendors’) microcontrollers.
2.7.1 Negotiating Operation Conditions
The operating condition negotiation function of the MultiMediaCard bus is not supported in SPI mode.
The host must work within the valid voltage range (2.7 to 3.6 volts) of the card.
2.7.2 Card Acquisition and Identification
The card acquisition and identification function of the MultiMediaCard bus is not supported in SPI mode.
The host must know the number of cards currently connected on the bus. Specific card selection is
done via the CS signal.
2.7.3 Card Status
In SPI mode only 16 bits (containing the errors relevant to SPI mode) can be read out of the
MultiMediaCard status register.
2.7.4 Memory Array Partitioning
Memory partitioning in SPI mode is equivalent to MultiMediaCard mode. All read and write commands
are byte addressable.
2.7.5 Read and Write Operations
In SPI mode, only single block read/write mode is supported.
2.7.6 Data Transfer Rate
In SPI mode only block mode is supported. The typical access time (latency) for each data block, in
read operation, is 1.5mS. The write typical access time (latency) for each data block, in read operation,
is 1.5mS. The write block operation is done in handshake mode. The card will keep DataOut line low
as long as the write operation is in progress and there are no write buffers available.
2.7.7 Data Protection in the MultiMediaCard
Same as for the MultiMediaCard mode.
2.7.8 Erase
Same as in MultiMediaCard mode
11
MultiMediaCardTM
2.7.9 Write Protection
Same as in MultiMediaCard mode
12
MultiMediaCardTM
3 Product Specifications
3.1 Recommended Operating Conditions
The recommended operating conditions define the parameter ranges for optimal performance and
durability of MultiMediaCard.
Parameter
Supply Voltage
Inputs
Low-level input
voltage
High-level
Input voltage
Outputs High-level
output current
Low-level output
current
Clock
Clock frequency
input
data transfer
clk*1
mode(pp)
Clock frequency
ident. Mode(od)
Clock cycle time
data transfer
mode(pp)
Clock cycle time
ident. Mode(pp)
Clock low time
Symbol
Vcc
VIL
Min
2.7
Vss-0.3
VIH
0.625*Vcc
IOH
-2
IOL
Typ
3.0
Max
3.6
0.258*
Vcc
Vcc+0.3
Unit
V
V
Remark
V
mA
6
mA
fPP
0
20
MHz
fOD
0
400
KHz
tPP=1/fPP
50
ns
tOD=1/fPP
2.5
us
tWL
10
ns
Clock high time
tWH
10
ns
Clock input rise
time
Clock input fall
time
Clock low time
tLH
10
ns
tHL
10
ns
tWL
50
ns
Clock high time
tWH
50
ns
Clock input rise
time
Clock input fall
time
tLH
50
ns
tHL
50
ns
CL<100pF
(10 cards)
CL<100pF
(10 cards)
CL<100pF
(10 cards)
CL<100pF
(10 cards)
CL<100pF
(10 cards)
CL<250pF
(30 cards)
CL<250pF
(30 cards)
CL<250pF
(30 cards)
CL<250pF
(30 cards)
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MultiMediaCardTM
3.2 Operating Characteristics
The operating characteristics are parameters measured in a MultiMediaCard system assuming the
recommended operating conditions.
Parameter
32MB
64MB
128MB
256MB
512MB
Minimal 32MB
supply
64MB
current
128MB
256MB
512MB
All digital Input leakage
current
inputs
(including
I/O
current)
All
High-level
outputs
output voltage
Low-level output
voltage
Inputs:
Input set-up
CMD,DAT time
(Referred Input hold time
to SCLK),
CS
Outputs: Output set-up
CMD,DAT time
(Referred Output hold
to CLK), time
D0
(Referred
to SCLK)
Symbol
Min
High
speed
supply
current
-10
VOH
Typ
Max
65
65
65
65
65
100
100
100
100
100
10
0.75*Vcc
VOL
0.125Vcc
Unit
mA
mA
mA
mA
mA
uA
uA
uA
uA
uA
uA
Remark
At 20MHz,
3.6V
At 0Hz, 3.6V
Standby
State
V
At min IOH
V
At max IOL
tISU
3
ns
tIH
3
ns
tOSU
5
ns
tOH
5
ns
At tLH=10ns
14
MultiMediaCardTM
Figure 3-1 Timing Diagram of Data Input and Output
3.3 System Environmental Specifications
Temperature
Operating
Non-Operating
-25’C to 85’C
-40’C to 85’C
Humidity
Non-Operating
8% to 95%. Non-condensing
0 dB
Acoustic Noise
Vibration
Shock
Operating
Non-Operating
Operating
Non-Operating
5 G Peak to Peak max.
5 G Peak to Peak max.
1,000 G max
1,000 G max
3.4 System Reliability and Maintenance
MTBF
Preventive Maintenance
Data Reliability
Endurance
>1,000,000 hours
None
< 1 non-recoverable error in 1014 bits read
1,000,000 write/erase cycles
15
MultiMediaCardTM
3.5 Physical Specifications
Dimensions of Normal MMC(24mm x 32mm x 1.4mm)
Dimensions of RS-MMC(24mm x 18mm x 1.4mm)
16
MultiMediaCardTM
4 MultiMediaCard Interface Description
4.1 Pin Assignments in MultiMediaCard Mode
Table 4-1 MultiMediaCard Pad Definition
Pin No.
1
2
3
4
5
6
7
Name
RSV
CMD
Vss1
Vcc
CLK
Vss2
DAT
Type*1
NC
I/O/PP/OD
S
S
I
S
I/O/PP
Description
No connection
Command/Response
Ground
Power supply
Clock
Ground
Data
Note : 1. S: power supply; I: input; O: output; PP: push-pull; OD: open-drain; NC: No connection or VIH
Figure 4-1 MultiMediaCard Mode I/O drivers
17
MultiMediaCardTM
4.2 Pin Assignments in SPI Mode
Table 4- 2 SPI Pad Definition
Pin No.
1
2
3
4
5
6
7
Name
CS
DI
Vss
Vcc
SCLK
Vss2
DO
Type*1
I
I
S
S
I
S
O/PP
Description
Chip Select
Data In
Ground
Power supply
Clock
Ground
Data out
Note : 1. S: power supply; I: input; O: output; PP: push-pull; OD: open-drain; NC: No connection or VIH
4.3 MultiMediaCard Bus Topology
The MultiMediaCard bus has three communication lines and four supply lines:
- CMD: Command is a bi-directional signal. Host and card drivers are operating in two modes, open
drain and push pull.
- DAT: Data is a bi-directional signal. Host and card drivers are operating in push pull mode.
- CLK: Clock is a host to card signal. CLK operates in push pull mode.
- VDD: VDD is the power supply line for all cards.
- VSS[1:2]: VSS are two ground lines.
Figure 4-2 Bus Circuitry Diagram
The ROD is switched on and off by the host synchronously to the open-drain and push-pull mode
transitions. RDAT and RCMD are pull-up resistors protecting the CMD and the DAT line against bus
floating when no card is inserted or when all card drivers are in a hi-impedance mode. A constant
current source can replace the ROD by achieving a better performance (constant slopes for the signal
18
MultiMediaCardTM
rising and falling edges). If the host does not allow the switchable ROD implementation, a fix RCMD can
be used. Consequently the maximum operating implementation, a fix RCMD can be used. Consequently
the maximum operating frequency in the open drain mode has to be reduced in this case.
4.4 SPI Bus Topology
4.4.1 SPI Interface Concept
The Serial Peripheral Interface (SPI) is a general-purpose synchronous serial interface originally found
on certain Motorola micro-controllers. The MultiMediaCard SPI interface is compatible with SPI hosts
available on the market. As any other SPI device the MultiMediaCard SPI channel consists of the
following 4 signals:
- CS : Host to card chip select signal
- CLK : Host to card clock signal
- DataIn : Host to card data signal
- DataOut : Card to host data signal
Another SPI common characteristic, which is implemented in the MultiMediaCard card as well, is byte
transfers. All data tokens are multiples of 8 bit bytes and always byte aligned to the CS signal. The SPI
standard defines the physical link only and not the complete data transfer protocol. The MultiMediaCard
uses a subset of the MultiMediaCard protocol and command set.
4.4.2 SPI Bus Topology
The MultiMediaCard card identification and addressing algorithms are replaced by hardware Chip Select
(CS) signal. There are no broadcast commands. A card (slave) is selected, for every command, by
asserting (active low) the CS signal (see Figure 4-3). The CS signal bust is continuously active for the
duration of the SPI transaction (command, response and data). The only exception is card-programming
time. At this time the host can de-assert the CS signal without affecting the programming process. The
bi-directional CMD and DAT lines are replaced by unidirectional dataIn and dataOut signals. This
eliminates the ability of executing commands while data is being read or written and, therefore,
eliminates the sequential and multi block read/write operations. The SPI channel supports only single
block read/write.
Figure 4-3 SPI Bus System
19
MultiMediaCardTM
4.5 Registers
Table 4-3 MultiMediaCard Information Registers
Name
OCR
Width
32
CID
128
RCA
16
CSD
128
Type
Programmed by the
manufacturer. Read only for
user
Programmed by the
manufacturer. Read only for
user
Programmed during
initialization, not readable
Programmed by the
manufacturer. Partially
Programmable by the user
Description
Supported voltage range, card power
up status bit
Card identification number, card
individual number for identification.
Relative card address, local system
address of a card, dynamically
assigned by the host during
initialization.
Card specific data, information about
the card operation conditions.
CID and RCA are used for identifying and addressing MultiMediaCard. CSD contains the card specific
data record. This record is a set of information fields to define the operation conditions of the
MultiMediaCard.
For the user the CID and the OCR are read only registers. They are read out by special commands
(refer to Chapter “Commands”). The RCA registers are write only registers. Unlike CID and CSD, RCA
looses its contents after powering down the card. Its value is reassigned in each initialization cycle.
The MultiMediaCard registers usage in SPI mode is summarized in Table “MultiMediaCard Registers in
SPI Mode
Table 4-4 Information Registers in SPI Mode
Name
OCR
CID
Width (bytes)
4
16
Available
Yes
Yes
RCA
CSD
16
No
Yes
Description
Operation condition register
Card identification data (serial number,
manufacturer ID etc.)
Card specific data, information about the card
operation conditions
4.5.1 Operation Condition Register (OCR)
This register indicates supported voltage range of MultiMediaCards. It is a 32 bit wide register and for
read only.
Table 4-5 OCR Fields
20
MultiMediaCardTM
OCR Slice
D31
D[30-24]
D23
D22
D21
D20
D19
D18
D17
D16
D15
D14
D13
D12
D11
D10
D9
D8
D7
D[6-0]
Field
Card power up status bit (busy)
Reserved
3.5 ~ 3.6V
3.4 ~ 3.5V
3.3 ~ 3.4V
3.2 ~ 3.3V
3.1 ~ 3.2V
3.0 ~ 3.1V
2.9 ~ 3.0V
2.8 ~ 2.9V
2.7 ~ 2.8V
2.6 ~ 2.7V
2.5 ~ 2.6V
2.4 ~ 2.5V
2.3 ~ 2.4V
2.2 ~2.3V
2.1 ~ 2.2V
2.0 ~ 2.1V
1.65 ~ 1.95V
Reserved
Value
0 or 1
0
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
Note
4.5.2 Card Identification (CID)
This register contains the card identification information used during the card identification procedure. It
is a 128 bit wide register, one-time programmable by the provider. The CID is divided into eight slices:
Table 4-6 CID Fields
Name
Manufacturer ID*1
OEM/Application ID
Product name
Product revision
Product serial number
Manufacturing date
CRC checksum
not used, always 1
Field
MID
OID
PNM
PRV
PSN
MDT
CRC
--
Width
8
16
48
8
32
8
7
1
CID-Slice
[127:120]
[119:104]
[103:56]
[55:48]
[47:16]
[15:8]
[7:1]
[0:0]
Note: 1. The value of MID is 0x15.
21
MultiMediaCardTM
4.5.3 Relative Card Address (RCA)
The 16-bit relative card address register carries the card address assigned by the host during the card
identification. This address is used for the addressed host to card communication after the card
identification procedure. The default value of the RCA register is 0x0001. The value 0x0000 is reserved
to set all cards in Standby State with the command SELECT_DESELECT_CARD (CMD7). The RCA is
programmed with the command SET_RELATIVE_ADDRESS (CMD3) during the initialization
procedure. The content of this register is lost after power down. The default value is assigned when an
internal reset is applied by the power up detection unit of the MultiMediaCard.
4.5.4 Card Specific Data (CSD)
The card specific data register describes how to access the card content. The CSD defines card
operating parameters like maximum data access time, data transfer speed.
Table 4-7 CSD Field
Name
CSD structure
Spec version
Reserved
Data read accesstime-1
Data read accesstime-2 in CLK
cycles NAC*100)
Max. data transfer
rate
Card command
classes
Max. read data
block length
Partial blocks for
read allowed
Write block
misalignment
Read block
misalignment
DSR implemented
Reserved
Device size
Max. read current
at VDD min
Max. read current
at VDD max
Max. write current
at VDD min
Max. write current
at VDD max
Field
CSD_STRUCTURE
SPEC_VERS
-TAAC
Width
2
4
2
8
CSD-slice
[127:126]
[125:122]
[121:120]
[119:112]
NSAC
8
[111:104]
TRAN_SPEED
8
[103:96]
CCC
12
[95:84]
READ_BL_LEN
4
READ_BL_PARTIAL
Value
0x2
0x3
0x0
0×26
(1.5 ms)
0×01
(100 cycles)
Type
read only
read only
read only
read only
read only
read only
[83:80]
0×2A
(20MHz,Max)
0×0F5
(Class 0,2,4,5, 6, 7)
0×9(512 bytes)
1
[79:79]
0x0(Disabled)
read only
WRITE_BLK_MISALIGN
1
[78:78]
0x0(Disabled)
read only
READ_BLK_MISALIGN
1
[77:77]
0x0 (Disabled)
read only
DSR_IMP
-C_SIZE
1
2
12
[76:76]
[75:74]
[73:62]
0x0 (Disabled)
0x0
*1
read only
read only
read only
VDD_R_CURR_MIN
3
[61:59]
*2
read only
VDD_R_CURR_MAX
3
[58:56]
*2
read only
VDD_W_CURR_MIN
3
[55:53]
*2
read only
VDD_W_CURR_MAX
3
[52:50]
*2
read only
read only
read only
22
MultiMediaCardTM
Device size
multiplier
Erase group size
Erase group size
multiplier
Write protect group
size
Write protect group
enable
Manufacturer
default ECC
Write speed factor
Max. write data
block length
Partial blocks for
write allowed
Reserved
File format group
Copy flag(OTP)
Permanent write
protection
Temporary write
protection
File format
ECC code
C_SIZE_MULT
3
[49:47]
*3
read only
ERASE_GRP_SIZE
ERASE_GRP_MULT
5
5
[46:42]
[41:37]
*5
0x1F
read only
read only
WP_GRP_SIZE
5
[36:32]
0x3
read only
WP_GRP_ENABLE
1
[31:31]
0x1
read only
DEFAULT_ECC
2
[30:29]
0x0
read only
R2W_FACTOR
WRITE_BLK_LEN
3
4
[28:26]
[25:22]
0x4
0x9
read only
read only
WRITE_BLK_PARTIAL
1
[21:21]
0x0
read only
-FILE_FORMAT_GRP
COPY
PERM_WRITE_PROTEC
T
TMP_WRITE_PROTECT
5
1
1
1
[20:16]
[15:15]
[14:14]
[13:13]
0x0
0x0
0x1
0x0
read only
Read/Write
Read/Write
Read/Write
1
[12:12]
0x0
FILE_FORMAT
ECC
2
2
[11:10]
[9:8]
0x0
0x0
CRC
CRC
7
[7:1]
×
0
[0:0]
0x1
Read/Write/
erase
Read/Write
Read/Write/
erase
Read/Write/
erase
read only
Not used, always 1
Notes:
1. This field is depended on the model. Refer to also C_SIZE_MULT
2. This field is depended on the model
3. This field is depended on the model. Refer to also C_SIZE
4. x means user programmable
5. This field is depended on the model. Refer to also ERASE_GRP_SIZE
Some of the CSD fields are one-time or multiple programmable by the customer or provider. All other
field values are fixed. The following section describes the CSD fields and their values for
MultiMediaCards :
CSD Register Structure
CSD_STRUCTURE
“10”
CSD Register Structure
CSD version No. 1.2
The CSD version of these MultiMediaCards is related to the “MultiMediaCard system specification,
Version 3.31”. The parameter CSD_STRUCTURE has permanently the value “10”.
23
MultiMediaCardTM
SPEC_VERS
Defines the Spec version supported by the card. It includes the commands set definition and the
definition of the card responses. The card identification procedure is compatible for all spec versions.
SPEC_VERS
“0011”
System specification version number
System specification version 3.31
The Spec version of these Samsung MultiMediaCards is related to the “MultiMediaCard system
specification,Version 3.31”. The parameter SPEC_VERS has permanently the value “0011”.
TAAC
Defines the asynchronous data access time:
TAAC bit
2:0
Description
Time exponent
6:3
Time mantissa
7
Reserved
Values
0 = 1 ns, 1 = 10 ns, 2 = 100 ns, 3 = 1
ms, 4 = 10 ms, 5= 100 ms, 6 = 1 ms,
7 = 10 ms
0 = reserved, 1 = 1.0, 2 = 1.2, 3 = 1.3,
5 = 1.5, 5 = 2.0, 6 = 2.5, 7 = 3.0,
8 = 3.5, 9 = 4.0, A = 4.5,B = 5.0,
C = 5.5, D = 6.0, E = 7.0, F = 8.0
Always ‘0’
The value for the asynchronous delay for these MultiMediaCards is 1.5 ms. The coded TAAC value is
0x26 (= 1.5 ms).
NSAC
Defines the worst case for synchronous data access time. The unit for NSAC is 100-clock cycles.
Therefore, maximum value for the data access time is 25.6K clock cycles. The total access time NAC as
expressed in the Table “Timing Values” is the sum of both TAAC and NSAC. It has to be computed by
the host for actual clock rate. The read access time should be interpreted as a typical delay for the first
data bit of a data block or stream. The value of NSAC for these MultiMediaCards is 0x01 (100-clock
cycles). For more details refer to Chapter “Operating Characteristics”.
TRAN_SPEED
The following table defines the maximum data transfer rate TRAN_SPEED:
Maximum Data Transfer Rate Definition
TRAN_SPEED bit
2:0
Description
Transfer rate exponent
6:3
Time mantissa
Values
0 = 100 kbit/s, 1 = 1 Mbit/s, 2 = 10
Mbit/s, 3 = 100 Mbit/s, 4...7 =
reserved
0x0 = reserved, 0x1 = 1.0, 0x2 = 1.2,
0x3 = 1.3, 0x4 = 1.5, 0x5 = 2.0, 0x6 =
2.5, 0x7 = 3.0, 0x8 = 3.5, 0x9 = 4.0,
0xA = 4.5, 0xB = 5.0, 0xC = 5.5, 0xD
24
MultiMediaCardTM
7
Reserved
= 6.0, 0xE = 7.0, 0xF = 8.0
Always ‘0’
These MultiMediaCards support a transfer rate between 0 and 20Mb/s. The parameter TRAN_SPEED is
0x2A.
CCC
The MultiMediaCard command set is divided into subsets (command classes). The card command class
register CCC defines which command classes are supported by this card. A set CCC bit means that the
corresponding command class is supported. For command class definition refer to Table “ Command
Classes”.
Supported Card Command Classes
CCC bit
0
1
…..
11
Supported card command classes
Class 0
Class 1
…..
Class 11
These MultiMediaCards support the command classes 0,2,4,5,6 and 7. The parameter CCC is
permanently assigned to the value 0x0F5.
READ_BLK_LEN
The data block length is computed as 2^READ_BLK_LEN.
Data Block Length
READ_BLK_LEN
0
1
…..
11
12-15
Block length
20 = 1 byte
21 = 2 bytes
…..
211 = 2,048 bytes
Reserved
The value of the parameter READ_BLK_LEN is 0x09 (512 bytes).
READ_BLK_PARTIAL
READ_BLK_PARTIAL defines whether partial block sizes can be used in block read command.
READ_BLK_PARTIAL = 0 means that only the block size defined by READ_BLOCK_LEN can be used
for block-orinted data transfer. READ_BLK_PARTIAL = 1 means that smaller blocks can be used as well.
The minimum block size will be equal to minimum addressable unit (one byte).
WRITE_BLK_MISALIGN
Defines if the data block to be written by one command can be spread over more than one physical
blocks of the memory device. The size of the memory block is defined in WRITE_BLK_LEN.
25
MultiMediaCardTM
WRITE_BLK_MISALIGN is permanently assigned to the value “0”, signaling that crossing physical block
boundaries is not allowed.
READ_BLK_MISALIGN
Defines if the data block to be read by one command can be spread over more than one physical block
of the memory device. The size of the data block is defined in READ_BLK_LEN. READ_BLK_MISALIGN
= 0 signals that crossing physical block boundaries is not allowed. READ_BLOCK_MISALIGN = 1
signals that crossing physical block boundaries is allowed. These MultiMediaCards do not support read
block operations with boundary crossing. The parameter READ_BLK_MISALIGN is permanently
assigned to the value “0”.
DSR_IMP
Defines if the configurable driver stage option is integrated on the card or not. If implemented a driver
stage register (DSR) must be implemented also.
DSR_IMP
0
1
DSR type
No DSR implemented
DSR implemented
The parameter DSR_IMP is permanently assigned to the value “0”.
C_SIZE
This parameter is used to compute the card capacity. The card capacity is computed from the entries
C_SIZE, C_SIZE_MULT and READ_BLK_LEN as follows:
Memory Capacity = BLOCKNR*BLOCK_LEN
Where
BLOCKNR = (C_SIZE+1)*MULT
MULT = 2C_SIZE_MULT+2 (C_SIZE_MULT < 8)
BLOCK_LEN = 2READ_BLK_LEN, (READ_BLK_LEN < 12)
The following table shows the card capacity for each model.
C-SIZE
0x7A7
0xF4F
0x3D3
0x7A7
0xF4F
0xF4F
C_SIZE_MULT
3
3
6
6
6
7
READ_BLK_LEN
9
9
9
9
9
9
Card Capacity
32Mbytes
64Mbytes
128Mbytes
256Mbytes
512Mbytes
1Gbytes
VDD_R_CURR_MIN, VDD_W_CURR_MIN
The maximum supply current at the minimum supply voltage VCC (2.7 V) is coded as follows
:
26
MultiMediaCardTM
Maximum Supply Current Consumption at VCC = 2.7 V
VDD_R_CURR_MIN / VDD_W_CURR_MIN
2:0
Code for current consumption at 2.7 V
2:0 0 = 0.5 mA; 1 = 1 mA; 2 = 5 mA;
3 = 10 mA; 4 = 25 mA; 5 = 35 mA;
6 = 60 mA; 7 = 100 mA
VDD_R_CURR_MAX, VDD_W_CURR_MAX
The maximum supply current at the maximum supply voltage VCC (3.6 V) is coded as follows:
Maximum Supply Current Consumption at VCC = 3.6 V
VDD_R_CURR_MAX / VDD_W_CURR_MAX Code for current consumption at 3.6 V
2:0
0 = 1 mA; 1 = 5 mA; 2 = 10 mA; 3 = 25 mA;
4 = 35 mA; 5 = 45 mA; 6 = 80mA; 7 = 200 mA
C_SIZE_MULT
This parameter is used for coding a factor MULT for computing the total device size (refer to ‘C_SIZE)
The factor MULT is defined as 2C_SIZE_MULT+2.
ERASE_GRP_SIZE
The contents of this register are a 5bit binary coded value, used to calculate the size of the erasable unit
of these MultimediaCard. The size of the erase unit (also referred to as erase group in chapter “memory
Array Partitioning”) is determined by the ERASE_GRP_SIZE and the ERASE_GRP_MULT entries of the
CSD
Size of erasable unit = (ERASE_GRP_SIZE + 1) * (ERASE_GRP_MULT + 1)
The following table shows the size of erase group for each model.
ERASE_GRP_SIZE
0x0
0x0
0x7
0x7
0x7
0x7
ERASE_GRP_MULT
0x1F
0x1F
0x1F
0x1F
0x1F
0x1F
Card Capacity
32Mbytes
64Mbytes
128Mbytes
256Mbytes
512Mbyes
1Gbytes
ERASE_GRP_MULT
A 5bit binary coded value is used for calculating the size of the erasable unit of these MultiMediaCards.
The parameter ERASE_GRP_MULT is permanently assigned to the value 0x1F. See
ERASE_GRP_SIZE section for detailed description.
27
MultiMediaCardTM
WP_GRP_SIZE
The size of a write protection group. The content of this register is a binary coded value defining the
number of erase group. This parameter's value is 8, which means that a write protect group size is 128
kByte.
WP_GRP_ENABLE
The value is set to ‘1’, meaning group write protection is enabled.
DEFAULT_ECC
Set by the card manufacturer and defines the ECC code, which is recommended to use (e.g. the device
is tested for). The value is set to ‘0’, indicating that no designated ECC is recommended.
R2W_FACTOR
Defines the typical block program time as a multiple of the read access time. The following table defines
the field format.
R2W_FACTOR
0
1
2
3
4
5
6
7
Multiples of read access time
1
2 (Write half as fast as read)
4
8
16
32
64
128
This parameter value is 4 for these MultiMediaCards.
WRITE_BLK_LEN
Block length for write operation. See READ_BL_LEN for field coding.
WRITE_BLK_PARTIAL
WRITE_BLK_PARTIAL defines whether partial block sizes can be used in block wrtie commands.
WRITE_BLK_PARTIAL = 0 means that only the block size defined by WRITE_BLOCK_LEN can be used
for block-orinted data transfer. WRITE_BLK_PARTIAL = 1 means that smaller blocks can be used as
well. The minimum block size will be equal to minimum addressable unit (one byte). These
MultiMediaCards support partial block read. The parameter WRITE_BLK_PARTIAL is permanently
assigned to the value “0”.
FILE_FORMAT_GRP
Indicated the selected group of file formats. This fiels is read-only for ROM. The usage of this fiels is
28
MultiMediaCardTM
shown in table “File_Formats”
COPY
Defines if the contents are an original (= 0) or a copy (= 1). The COPY bit is a one time programmable bit,
being set by the customer.
PERM_WRITE_PROTECT
Permanently protects the whole card content against overwriting or erasing (all write and erase
commands for this card is a permanently disabled). This parameter is one-time programmable by the
customer. The default value is ‘0’ (not protected).
TMP_WRITE_PROTECT
Temporarily protects the whole card content from being overwritten or erased (all write and erase
commands for this card are temporarily disabled). This parameter is programmable by the customer. The
default value is ‘0’ (not protected).
FILE_FORMAT
Indicates the file format on the card. This field is read-only for ROM. The following formats are defined.
FILE_FORMAT
_GRP
0
0
0
0
1
FILE_FOR
MAT
0
1
2
3
0,1,2,3
Type
Hard disk-like file system with partition table
DOS FAT (floppy-like) with boot sector only (no partition table)
Universal File Format
Others/Unknown
Reserved
ECC
Defines the ECC code that was used for storing data on the card. This field is used by the host (or
application) to decode the user data. The following table defines the field format.
ECC
0
1
2-3
ECC Type
None (default)
BCH (542,512)
0,1,2,3
Maximum number of correctable bits
None
3
-
The content provider or customer defines which kind of error correction may be used to protect the
contents of MultiMediaCard. This value is programmable.
CRC7
The CRC7 contains the check sum for the CSD content. The check sum is computed according to
chapter “Cyclic Redundancy Check(CRC)”.
29
MultiMediaCardTM
4.6 MultiMediaCard Communication
All communication between host and cards is controlled by the host (master). The host sends
commands and, depending on the command, receives a corresponding response from the selected
card. In this chapter the commands to control the MultiMediaCard, the card responses and the
contents of the status and error field included in the responses, are defined.
4.6.1 Commands
The command set of the MultiMediaCard system is divided into classes corresponding to the type of
card. The MultiMediaCard supports the following command classes:
Table 4-8 Command Classes
Class
Class 0
Calss 1
Class 2
Class 3
Class 4
Class 5
Class 6
Class 7
Command
0
1
2
3
4
7
9
10
12
13
15
11
16
17
18
20
24
25
26
27
32
33
34
35
36
37
38
28
29
30
42
Class Description
Basic
Stream read (not supported)
Block read
Stream write (not supported)
Block write
Erase
(not supported CMD 32~34 and 37 according to
MMC system spec 3.31)
Write protection
Lock card
30
MultiMediaCardTM
Class 0 is mandatory and supported by all cards. It represents the card identification and initialization
commands, which are intended to handle different cards and card types on the same bus lines. The
Card Command Class (CCC) is coded in the card specific data register of each card, so that the host
knows how to access the card. There are four kinds of commands defined on the MultiMediaCard bus:
- broadcast commands (bc) sent on CMD line, no response.
- broadcast commands with response (bcr) sent on CMD line, response (all cards simultaneously) on
CMD line
- addressed (point-to-point) commands (ac) sent on CMD line, response on CMD line.
- addressed (point-to-point) data transfer commands (adtc) sent on CMD line, response on CMD line,
data transfer on DAT line.
The command transmission always starts with the MSB. Each command starts with a start bit and ends
with a CRC command protection field followed by an end bit. The length of each command frame is
fixed to 48 bits (2.4 us at 20 MHz):
0
Start bit
1
Host
Bit5 …. Bit0
Command
Bit31 …. Bit0
Argument
Bit6 …. Bit0
CRC*1
1
End Bit
The start bit is always ‘0’ in command frames (sent from host to MultiMediaCard). The host bit is
always ‘1’ for commands. The command field contains the binary coded command number. The
argument depends on the command (refer to Table “Basic Commands (class 0) and Table “BlockOriented Read Commands (class 2)”). The CRC field is defined in Chapter “Cyclic Redundancy Check
(CRC)”.
The MultiMediaCard supports the following MultiMediaCard commands :
Table 4-8 Detailed Command Description
CMD
Index
CMD0
CMD1
Type
bc
bcr
Argument
[31:0] stuff bits
[31:0] OCR
without busy
Resp
ㅡ
R3
Abbreviation
GO_IDLE_STATE
SEND_OP_COND
CMD2
bcr
[31:0] stuff bits
R2
ALL_SEND_CID
CMD3
ac
R1
CMD4
bc
[31:16] RCA
[15:0] stuff bits
[31:16] DSR
[15:0] stuff bits
SET_RELATIVE_A
DDR
SET_DSR
CMD7
ac
[31:16] RCA
[15:0] stuff bits
R1 (only SELECT/
the
DESELECT_CARD
select
ed
card)
CMD8
CMD9
reserved
ac
[31:16] RCA
ㅡ
R2
SEND_CSD
Command description
Resets all card to Idle State
Checks for cards not supporting the full
range of 2.0V to 3.6V. After receiving CMD1
the card sends an R3 response (refer to
Chapter “Responses”).
Asks all cards in ready state to send their
CID *1 numbers on CMD-line
Assigns relative address to the card in
identification state.
Programs the DSR of all cards in stand-by
state.
These Samsung MultiMediaCard do not
support this command
Command toggles a card between the
standby and transfer states or between the
programming and disconnect state. In both
cases the card is selected by its own
relative address while deselecting the prior
selected card. Address 0 deselects all.
Asks the addressed card to send its card31
MultiMediaCardTM
CMD10
ac
CMD11
adtc
CMD12
ac
CMD13
ac
CMD14
CMD15
CMD16
[15:0] stuff bits
[31:16] RCA
[15:0] stuff bits
[31:0] data
address
[31:0] stuff bits
R2
SEND_CID
R1
READ_DAT_UNTIL
_STOP
R1
or STOP_TRANSMISS
R1b *3
ION
[31:16] RCA
[15:0] stuff bits
reserved
ac
[31:16] RCA
[15:0] stuff bits
R1
SEND_STATUS
ㅡ
GO_INACTIVE_STA
TE
ac
[31:0] block
length
R1
SET_BLOCKLEN
[31:0] data
address
[31:0] data
address
R1
CMD17
adtc
CMD18
adtc
CMD19
CMD20
adtc
specific data (CSD) *2 on CMD-line.
Asks the addressed card to send its card
identification (CID) on CMD-line.
Reads data stream from the card, starting at
the given address, until a
STOP_TRANSMISSION follows.
These Samsung MultiMediaCard do not
support this command
Terminates a read/write stream/multiple
block operation. When CMD12 is used to
terminate a read transaction the card will
respond with R1. When it is used to stop a
write transaction the card will respond with
R1b.
Asks the addressed card to send its status
register.
Sets the card to inactive state in order to
protect the card stack against
communications breakdowns.
Selects a block length (in bytes) for all
following block commands (read and write).
*4
R1
READ_SINGLE_BL
OCK
READ_MULTIPLE_
BLOCK
Reads a block of the size selected by the
SET_BLOCKLEN command. *5
Continuously send blocks of data until
interrupted by a stop.
WRITE_DAT_UNTIL
_STOP
Writes data stream from the host, starting at
the given address, until a
STOP_TRANSMISSION follows.
These Samsung MultiMediaCard do not
support this command
Defines the number of blocks which are
going to be transferred in the immediatedly
succeeding multiple block read or write
command.
Writes a block of the size selected by the
SET_BLOCKLEN command. *6
Continuously writes blocks of data until a
STOP_TRANSMISSION follows.
Programming of the card identification
register. This command is only done once
per MultiMediaCard card. The card has
some hardware to prevent this operation
after the first programming. Normally this
command is reserved for the manufacturer.
Programming of the programmable bits of
the CSD.
If the card has write protection features, this
command sets the write protection bit of the
addressed group. The properties of write
protection are coded in the card specific
reserved
[31:0] data
address
R1
CMD21
…
CMD22
CMD23
reserved
ac
[31:16] set to 0 R1
[15:0] number
of blocks
SET_BLOCK_COU
NT
CMD24
adtc
R1
WRITE_BLOCK
CMD25
adtc
R1
CMD26
adtc
[31:0] data
address
[31:0] data
address
[31:0] stuff bits
R1
WRITE_MULTIPLE_
BLOCK
PROGRAM_CID
CMD27
adtc
[31:0] stuff bits
R1
PROGRAM_CSD
CMD28
ac
[31:0] data
address
R1b
SET_WRITE_PROT
32
MultiMediaCardTM
CMD29
ac
[31:0] data
address
R1b
CLR_WRITE_PROT
CMD30
adtc
[31:0] write
protect data
address
R1(7)
SEND_WRITE_PR
OT
CMD31
Reversed
CMD35
ac
CMD36
ac
CMD38
CMD42
data (WP_GRP_SIZE).
If the card provides write protection
features, this command clears the write
protection bit of the addressed group.
If the card provides write protection
features, this command asks the card to
send the status of the write protection bits.
*7
[31:0] data
R1
address
[31:0]
data R1
address
TAG_ERASE_GRO
UP_START
TAG_ERASE_GRO
UP_END
ac
adtc
[31:0] stuff bits
[31:0] stuff bits
R1b
R1b
ERASE
LOCK_UNLOCK
CMD55
ac
[31:16] RCA
[15:0] stuff
bits
R1
APP_CMD
CMD56
adtc
[31:1] stuff
bits.
[0]: RD/WR
R1b
GEN_CMD
Sets the address of the first erase group
within a range to be selected for erase
Sets the address of the last erase group
within a continuous range to be selected for
erase.
Erases all previously selected sectors
Used to set/reset the password or
lock/unlock the card. The size of the data
block is set by the SET_BLOCK_LEN
command.
Indicates to the card that the next command
is an application specific command rather
than a standard command
These Samsung MultiMediaCard do not
support this command
Used either to transfer a data block to the
card or to get a data block from the card for
general purpose / application specific
commands. The size of the data block shall
be set by the SET_BLOCK_LEN command.
These Samsung MultiMediaCard do not
support this command
Note :
1. CID register consists of 128 bits (starting with MSB, it is preceded by an additional start bit, ends with an end bit)
2. CSD register consists of 128 bits (starting with MSB, it is preceded by an additional start bit, ends with an end
bit)
3. This command is indicating the busy status of the MultiMediaCard via the data channel.
4. The default block length is as specified in the CSD.
5. The data transferred must not cross a physical block boundary unless RD_BLK_MISALIGN is set in the CSD.
6. The data transferred must not cross a physical block boundary unless WRITE_BLK_MISALIGN is set in the CSD.
7. 32 write protection bits (representing 32 write protect groups starting at the specified address followed by 16
CRC bits are transferred in a payload format via the data line. The last (least significant) bit of the protection bits
corresponds to the first addressed group. If the addresses of the last groups are outside the valid range, then the
corresponding write protection bits shall be set to zero.
4.7 Read, Write and Erase Time-out Conditions
The times after which a time-out condition for read/write/erase operations occurs are (card independent) 10 times longer than the access/program times for these operations given below. A card shall
complete the command within this time period, or give up and return an error message. If the host does
not get a response within the defined time-out it should assume the card is not going to respond
anymore and try to recover (e.g. reset the card, power cycle, reject, etc.). The typical access and
program times are defined as follows
33
MultiMediaCardTM
Read
The read access time is defined as the sum of the two times given by the CSD parameters TAAC and
NSAC (refer to Table “Card Specific Data (CSD)”). These card parameters define the typical delay
between the end bit of the read command and the start bit of the data block. This number is card
dependent and should be used by the host to calculate throughput and the maximal frequency for
stream read.
Write
The R2W_FACTOR field in the CSD is used to calculate the typical block program time obtained by
multiplying the read access time by this factor. It applies to all write/erase commands (e.g.
SET(CLEAR)_WRITE_PROTECT, PROGRAM_CSD(CID) and the block write commands). It should
be used by the host to calculate throughput.
Erase
The duration of an erase command will be (order of magnitude) the number of sectors to be erased
multiplied by the block write delay.
4.8 Card Identification Mode
All the data communication in the card identification mode uses only the command line (CMD).
MultiMediaCard State Diagram (Card Identification Mode)
Figure 4-2 MultiMediaCard State Diagram (Card Identification Mode)
The host starts the card identification process in open drain mode with the identification clock rate fOD
34
MultiMediaCardTM
(generated by a push pull driver stage). The open drain driver stages on the CMD line allow the parallel
card operation during card identification. After the bus is activated the host will request the cards to send
their valid operation conditions with the command SEND_OP_COND (CMD1). Since the bus is in open
drain mode, as long as there is more than one card with operating conditions restrictions, the host gets in
the response to the CMD1 a “wired or” operation condition restrictions of those cards. The host then
must pick a common denominator for operation and notify the application that cards with out of range
parameters (from the host perspective) are connected to the bus. Incompatible cards go into Inactive
State (refer to also Chapter “Operating Voltage Range Validation”). The busy bit in the CMD1 response
can be used by a card to tell the host that it is still working on its power-up/reset procedure (e.g.
downloading the register information from memory field) and is not ready yet for communication. In this
case the host must repeat CMD1 until the busy bit is cleared. After an operating mode is established, the
host asks all cards for their unique card identification (CID) number with the broadcast command
ALL_SEND_CID (CMD2).
All not already identified cards (i.e. those which are in Ready State) simultaneously start sending their
CID numbers serially, while bit-wise monitoring their outgoing bitstream. Those cards, whose outgoing
CID bits do not match the corresponding bits on the command line in any one of the bit periods, stop
sending their CID immediately and must wait for the next identification cycle (cards stay in the Ready
State). There should be only one card which successfully sends its full CID-number to the host. This card
then goes into the Identification State. The host assigns to this card (using CMD3,
SET_RELATIVE_ADDR) a relative card address (RCA, shorter than CID), which will be used to address
the card in future communication (faster than with the CID). Once the RCA is received the card transfers
to the Standby State and does not react to further identification cycles. The card also switches the output
drivers from the open-drain to the push-pull mode in this state. The host repeats the identification
process as long as it receives a response (CID) to its identification command (CMD2). When no card
responds to this command, all cards have been identified. The time-out condition to recognize this, is
waiting for the start bit for more than 5 clock periods after sending CMD2
4.8.1 Operating Voltage Range Validation
The MultiMediaCard standards operating range validation is intended to support reduced voltage range
MultiMediaCards. The MultiMediaCard supports the range of 2.7 V to 3.6V supply voltage. So the
MultiMediaCard sends a R3 response to CMD1 which contains an OCR value of 0x80FF8000 if the
busy flag is set to “ready” or 0x00FF8000 if the busy flag is active (refer to Chapter “Responses”). By
omitting the voltage range in the command, the host can query the card stack and determine the
common voltage range before sending out-of-range cards into the Inactive State. This bus query
should be used if the host is able to select a common voltage range or if a notification to the application
of non usable cards in the stack is desired. Afterwards, the host must choose a voltage for operation
and reissue CMD1 with this condition sending incompatible cards into the Inactive State.
4.9 Data Transfer Mode
When in Standby State, both CMD and DAT lines are in the push-pull mode. As long as the content of
all CSD registers is not known, the f PushPull clock rate is equal to the slow f OpenDrain clock rate.
SEND_CSD (CMD9) allows the host to get the Card Specific Data (CSD register), e.g. ECC type, block
length, card storage capacity, maximum clock rate etc..
35
MultiMediaCardTM
Figure 4-3 MultiMediaCard State Diagram (Data Transfer Mode)
The command SELECT_DESELECT_CARD (CMD7) is used to select one card and place it in the
Transfer State. If a previously selected card is in the Transfer State its connection with the host is
released and it will move back to the Stand-by State. Only one card can be, at any time, in the Transfer
State. A selected card is responding the CMD7, the deselected one does not respond to this command.
When CMD7 is sent including the reserved relative card address “0x0000”, all cards transfer back to
Stand-by State. This command is used to identify new cards without resetting other already acquired
cards. Cards to which an RCA has already been assigned, do not respond to the identification
command flow in this state. All the data communication in the Data Transfer Mode is consequently a
point-to point communication between the host and the selected card (using addressed commands).
All addressed commands are acknowledged by a response on the CMD line. All read commands (data
is sent from the card via data lines) can be interrupted at any time, by a stop command. The data
transfer will terminate and the card will stop or start working on the next command. The DAT bus line
signal level is high when no data is transmitted. A transmitted data block consists of a start bit (LOW),
followed by a continuous data stream.
The data stream contains the net payload data (and error correction bits if an off-card ECC is used).
The data stream ends with an end bit (HIGH). The data transmission is synchronous to the clock signal.
The payload for block-oriented data transfer is preserved by a CRC check sum (refer to Chapter
“Cyclic Redundancy Check (CRC)”).
4.9.1 Block Read
The basic unit of data transfer is a block whose maximum size is defined in the CSD
(READ_BLK_LEN). A CRC is appended to the end of each block ensuring data transfer integrity.
READ_SINGLE_BLOCK (CMD17) starts a block read and after a complete transfer the card goes back
to Transfer State. READ_MULTIPLE_BLOCK (CMD18) starts a transfer of several consecutive blocks.
Two types of multiple block read transactions are defined (the host can use either one at any time):
* Open-ended Multiple block read : The number of blocks for the read multiple block operation is not
36
MultiMediaCardTM
defined. The card will continuously transfer data blocks until a stop transmission command is
received.
* Multiple block read with pre-defined block count : The card will transfer the requested number of
data blocks, terminate the transaction and return to transfer state. Stop command is not required at
the end of this type of multiple block read, unless terminated with an error. In other to start multiple
block read with pre-defined block count, the host must use the SET_BLOCK COUNT
command(CMD23) immediately preceding the READ_MULTIPLE_BLOCK(CMD18) command.
Otherwise this card will start an open-ended multiple block read which can be stopped using the
STOP_TRANSMISSION command.
4.9.2 Block Write
Block write (CMD24 - 27) means that one or more blocks of data are transferred from the host to the
card with a CRC appended to the end of each block by the host. A card supporting block write must
always be able to accept a block of data defined by WRITE_BLK_LEN. If the CRC fails, the card will
indicate the failure on the DAT line; the transferred data will be discarded and not written and all further
transmitted blocks (in multiple block write mode) will be ignored. The write operation will also be
aborted if the host tries to write over a write-protected area. In this case, however, the card will set the
WP_VIOLATION bit. Programming of the CID and CSD register does not require a previous block
length setting. The transferred data is also CRC protected. The MultiMediaCard write operation follows
some special rules:
WRITE_MULTIPLE_BLOCK(CMD25) starts a transfer of several consecutive blocks. Two types of
multiple block write transactions, identical to the multiple block read, are defined (the host can use
either on at any time)
* Open-ended Multiple block write : The number of blocks for the write multiple block operation is not
defined. The card will continuously accept and program data block until a stop transmission
command is received.
* Multiple block write with pre-defined block count : The card will transfer the requested number of data
blocks, terminate the transaction and return to transfer state. Stop command is not required at the
end of this type of multiple block write, unless terminated with an error. In other to start multiple
block write with pre-defined block count, the host must use the SET_BLOCK COUNT
command(CMD23) immediately preceding the WRITE_MULTIPLE_BLOCK(CMD25) command.
Otherwise this card will start an open-ended multiple block write which can be stopped using the
STOP_TRANSMISSION command.
The host can abort writing at any time, within a multiple block operation regardless of the its type.
Transaction abort is done by sending the stop transmission command. If a multiple block write with
predefined block count is aborted, the data in the remaining blocks is not defined.
4.9.3 Erase
The erasable unit is the Erase Group. Erase group is measured in write blocks which are the basic
writable units of the card. The size of the Erase group is a card specific parameter and defined in the
CSD.
The host can erase a contiguous range of Erase Groups. Starting the erase process is a three steps
sequence. First the host defines the start address of the range using the
ERASE_GROUP_START(CMD35) command, next it defines the last address of the range using the
37
MultiMediaCardTM
ERASE_GROUP_END(CMD36) command and finally it starts the erase process by issuing the
ERASE(CMD38) command. The address field in the erase commands is an Erase Group address in
byte units. The card will all LSB’s below the Erase Group size, effectively rounding the address down to
the Erase Group boundary.
If an erase command is received out of sequence, the card shall set the ERASE_SEQ_ERROR bit in
the status register and reset the whole sequence.
If an out of sequence(neither of the erase commands, except SEND_STATUS) command received, the
card shall set the ERASE_RESET status bit in the status register, reset the erase sequence and
execute the last command.
If the erase range includes write protected blocks, the shall be left intact and only the non-protected
blocks shall be erased. The WP_ERASE_SKIP status bit in the status register shall be set.
As described above for block write, the card will indicate that an erase is in progress by holding DAT
low The actual erase time may be quite long, and the host may issue CMD7 to deselect the card.
4.9.4 Write Protect Management
Card data may be protected against either erase or write. The entire card may be permanently write
protected by the manufacturer or content provider by setting the permanent or temporary write protect
bits in the CSD. Portions of the data may be protected (in units of WP_GRP_SIZE sectors as specified
in the CSD), and the write protection may be changed by the application. The SET_WRITE_PROT
command sets the write protection of the addressed write-protect group, and the CLR_WRITE_PROT
command clears the write protection of the addressed write-protect group. The SEND_WRITE_PROT
command is similar to a single block read command. The card shall send a data block containing 32
write protection bits (representing 32 write protect groups starting at the specified address) followed by
16 CRC bits. The address field in the write protect commands is a group address in byte units. The
card will ignore all LSB’s below the group size.
4.9.5 Card Lock/Unlock Operation
The password protection feature enables the host to lock a card while providing a password, which
later will be used for unlocking the card. The password and its size are kept in a 128-bit PWD and 8-bit
PWD_LEN registers, respectively. These registers are non-volatile so that a power cycle will not erase
them. Locked cards respond to (and execute) all commands in the "basic" command class (class 0)
and “lock card” command class. Thus the host is allowed to reset, initialize, select, query for status,
etc., but not to access data on the card. If the password was previously set (the value of PWD_LEN is
not‘0’) will be locked automatically after power on. Similar to the existing CSD and CID register write
commands the lock/unlock command is available in "transfer state" only. This means that it does not
include an address argument and the card has to be selected before using it. The card lock/unlock
command has the structure and bus transaction type of a regular single block write command. The
transferred data block includes all the required information of the command (password setting mode,
PWD itself, card lock/unlock etc.). The following table describes the structure of the command data
block.
Table 4-9 Card Lock Data Structure
Byte#
0
1
2
…
PWD_LEN+1
Bit7
Bit6
Bit5
Reserved
Bit4
Bit3
ERASE
Bit2
LOCK_
UNLOCK
Bit1
CLR_
PWD
Bit0
SET_
PWD
PWD_LEN
Password data
38
MultiMediaCardTM
* ERASE: 1 Defines Forced Erase Operation (all other bits shall be ‘0’) and only the cmd byte is sent.
* LOCK/UNLOCK: 1 = Locks the card. 0 = Unlock the card (note that it is valid to set this bit together
with SET_PWD but it is not allowed to set it together with CLR_PWD).
* CLR_PWD: 1 = Clears PWD.
* SET_PWD: 1 = Set new password to PWD
* PWD_LEN: Defines the following password length (in bytes).
* PWD: The password (new or currently used depending on the command).
The data block size shall be defined by the host before it sends the card lock/unlock command. This
will allow different password sizes. The following paragraphs define the various lock/unlock
command sequences:
39
MultiMediaCardTM
* Setting the Password
- Select a card (CMD7), if not previously selected already
- Define the block length (CMD16), given by the 8bit card lock/unlock mode, the 8-bit password
Size (in bytes), and the number of bytes of the new password. In case that a password
replacement is done, then the block size shall consider that both passwords, the old and the new
one, are sent with the command.
- Send Card Lock/Unlock command with the appropriate data block size on the data line including
16 bit CRC. The data block shall indicate the mode (SET_PWD), the length (PWD_LEN) and the
password itself. In case that a password replacement is done, then the length value (PWD_LEN)
shall include both passwords, the old and the new one, and the PWD field shall include the old
password (currently used) followed by the new password.
In case that the sent old password is not correct (not equal in size and content) then
LOCK_UNLOCK_FAILED error bit will be set in the status register and the old password
password and its size will be saved in the PWD and PWD_LEN fields, respectively.
Note that the password length register (PWD_LEN) indicates if a password is currently set. When it
equals ‘0’ there is no password set. If the value of PWD_LEN is not equal to zero the card will lock
itself after power up. It is possible to lock the card immediately in the current power session by setting the LOCK/UNLOCK bit (while setting the password) or sending additional command for card lock.
* Reset the Password:
- Select a card (CMD7), if not previously selected already
- Define the block length (CMD 16), given by the 8bit card lock/unlock mode, the 8bit password
size (in bytes), and the number of bytes of the currently used password.
- Send the card lock/unlock command with the appropriate data block size on the data line
including 16 bit CRC. The data block shall indicate the mode CLR_PWD, the length (PWD_LEN)
and the password (PWD) itself (LOCK/UNLOCK bit is don’t care). If the PWD and PWD_LEN
content match the sent password and its size, then the content of the PWD register is cleared and
PWD_LEN is set to 0. If the password is not correct then the LOCK_UNLOCK_FAILED error bit
will be set in the status register.
* Locking a card:
- Select a card (CMD7), if not previously selected already
- Define the block length (CMD16), given by the 8 bit card lock/unlock mode, the 8 bit password
size (in bytes), and the number of bytes of the currently used password.
- Send the card lock/unlock command with the appropriate data block size on the data line
including 16 bit CRC. The data block shall indicate the mode LOCK, the length (PWD_LEN) and
the password (PWD) itself.
If the PWD content equals to the sent password then the card will be locked and the card-locked
status bit will be set in the status register. If the password is not correct then
LOCK_UNLOCK_FAILED error bit will be set in the status register. Note that it is possible to set the
password and to lock the card in the same sequence. In such case the host shall perform all the
required steps for setting the password (as described above) including the bit LOCK set while the
new password command is sent. If the password was previously set (PWD_LEN is not ‘0’), then the
card will be locked automatically after power on reset. An attempt to lock a locked card or to lock a
card that does not have a password will fail and the LOCK_UNLOCK_FAILED error bit will be set in
40
MultiMediaCardTM
the status register.
* Unlocking the card:
- Select a card (CMD7), if not previously selected already.
- Define the block length (CMD16), given by the 8 bit card lock/unlock mode, the 8 bit password
size (in bytes), and the number of bytes of the currently used password.
- Send the card lock/unlock command with the appropriate data block size on the data line
including 16 bit CRC. The data block shall indicate the mode UNLOCK, the length (PWD_LEN)
and the password (PWD) itself.
If the PWD content equals to the sent password then the card will be unlocked and the card-locked
status bit will be cleared in the status register. If the password is not correct then the
LOCK_UNLOCK_FAILED error bit will be set in the status register. Note that the unlocking is done
only for the current power session. As long as the PWD is not cleared the card will be locked
automatically on the next power up. The only way to unlock the card is by clearing the password. An
attempt to unlock an unlocked card will fail and LOCK_UNLOCK_FAILED error bit will be set in the
status register.
* Forcing Erase:
In case that the user forgot the password (the PWD content) it is possible to erase all the card data
content along with the PWD content. This operation is called Forced Erase.
- Select a card (CMD7), if not previously selected already.
- Define the block length (CMD16) to 1 byte (8bit card lock/unlock command). Send the card
lock/unlock command with the appropriate data block of one byte on the data line including 16 bit
CRC. The data block shall indicate the mode ERASE (the ERASE bit shall be the only bit set).
If the ERASE bit is not the only bit in the data field then the LOCK_UNLOCK_FAILED error bit will be
set in the status register and the erase request is rejected. If the command was accepted then ALL
THE CARD CONTENT WILL BE ERASED including the PWD and PWD_LEN register content and
the locked card will get unlocked. An attempt to force erase on an unlocked card will fail and
LOCK_UNLOCK_FAILED error bit will be set in the status register.
* State transition summary
Table “Card State Transition Table” defines the card state transitions as a function of received
command
4.9.6 Responses
All responses are sent via command line (CMD), all data starts with the MSB.
Table 4-10 Format R1(Response Command)
0
start bit
0
card
bit5 … bit0
command
Bit31 … bit0
status
Bit6 … bit0
CRC
1
end bit
The contents of the status field are described in Chapter “Status
Format R1b (response command with busy signal):
41
MultiMediaCardTM
R1b is identical to R1 with an optional busy signal transmitted on the data line. The card may become
busy after receiving these commands based on its state prior to the command reception
Format R2 (CID, CSD register): response length 136 bits.
Note: Bit 127 down to bit 1 of CID and CSD are transferred, the reserved bit [0] is replaced by the end
bit
Table 4-11 Format R2(CID, CSD Register) : Response Length 136 bits
0
start bit
0
card
bit5 … bit0
reserved
Bit127 … bit1
1
CID or CSD register end bit
including internal CRC
Format R3 (OCR): response length 48 bits.
The OCR is sent as a response to the CMD1 to signalize the supported voltage range. The
MultiMediaCard supports the range from 2.7 V to 3.6 V. Respectively the value of all bits of the OCR
field of the MultiMediaCard is set to 0x80FF8000. So the R3 frame of the MultiMediaCard contains the
value 0x3F80FF8000FF if the card is ready and 0x3F00FF8000FF if the card is busy.
Table 4-12 OCR : Response length 50Hz
0
start bit
0
card
bit5 … bit0
reserved
Bit31 … bit0
OCR field
Bit6 … bit0
reserved
1
end bit
4.9.7 Status
The response format R1 contains a 32-bit field with the name card status. This field is intended to
transmit status information which is stored in a local status register of each card to the host. The
following table defines the status register structure. The Type and Clear-Condition fields in the table
are coded as follows:
- Type:
E: Error bit.
S: Status bit.
R: Detected and set for the actual command response.
X: Detected and set during command execution. The host must poll the card by sending status
- Clear Condition:
A : According to the card state.
B: Always related to the previous command. Reception of a valid
command will clear it (with a delay of one command).
C: Clear by read.
42
MultiMediaCardTM
Table 4-13 Status
Bits
Identifier
Type
Value
31
OUT_OF_RANGE
ER
30
ADDRESS_ERROR
ERX
‘0’ = no error
‘1’ = error
‘0’ = no error
‘1’ = error
29
BLOCK_LEN_ERR
OR
ER
‘0’ = no error
‘1’ = error
28
ER
27
ERASE_SEQ_ERR
OR
ERASE_PARAM
EX
26
WP_VIOLATION
ERX
25
CARD_IS_LOCKED
SX
24
LOCK_UNLOCK_FA
ILED
ERX
‘0’ = no error
‘1’ = error
‘0’ = no error
‘1’ = error
‘0’ = not protected
‘1’ = protected
‘0’ = card unlocked
‘1’ = card locked
‘0’ = no error
‘1’ = error
23
COM_CRC_ERROR
ER
22
ER
19
ILLEGAL_COMMAN
D
CARD_ECC_FAILE
D
ERROR
ERX
18
UNDERRUN
EX
17
OVERRUN
EX
16
CID_OVERWRITE/
CSD_OVERWRIT
E
ERX
15
WP_ERASE_SKIP
SX
‘0’ = not protected
‘1’ = protected
14
CARD_ECC_DISAB
LED
ERASE_RESET
SX
‘0’ = enabled
‘1’ = disabled
‘0’ = cleared
‘1’ = set
21
13
12:9 CURRENT_STATE
EX
SR
SX
‘0’ = no error
‘1’ = error
‘0’ = no error
‘1’ = error
‘0’ = success
‘1’ = failure
‘0’ = no error
‘1’ = error
‘0’ = no error
‘1’ = error
‘0’ = no error
‘1’ = error
‘0’ = no error
‘1’ = error
0 = idle
1 = ready
2 = ident
Description
Clear
condition
The commands argument was out of C
allowed range for this card.
A misaligned address, which did not match C
the block length was used in the
command.
The transferred block length is not allowed C
for this card or the number of transferred
bytes does not match the block length
An error in the sequence of erase C
commands occurred.
An invalid selection, sectors or groups, for C
erase.
The command tried to write a write C
protected block.
When set, signals that the card is locked by A
the host.
Set when a sequence or password error C
has been detected in lock/unlock card
command or it there was an attempt to
access a locked card.
The CRC check of the previous command B
failed.
Command not legal for the current state
B
Card internal ECC was applied but the
correction of data is failed.
A general or an unknown error occurred
during the operation.
The card could not sustain data transfer in
stream read mode.
The card could not sustain data
programming in stream write mode.
can be either one of the following errors :
- The CID register is already written and
can not be overwritten.
- The read only section of the CSD does
not match the card content.
- An attempt to reversecopy (set as original)
or permanent WP (unprotect) bits was
done.
Only partial address space was erased due
to existing WP blocks.
C
C
C
C
C
C
The command has been executed without A
using the internal ECC.
An erase sequence was cleared before C
executing because an out of erase
sequence command was received
Current state of the card.
B
43
MultiMediaCardTM
3 = stby
4 = tran
5 = data
6 = rcv
7 = prg
8 = dis
9–15 = reserved
‘0’ = not ready
‘1’ = ready
Permanently 0
‘0’ = disabled
‘1’ = enabled
8
EADY_FOR_DATA
SX
7:6
5
reserved
APP_CMD
SR
4
3:2
1:0
reserved
Permanently 0
reserved for application specific commands
reserved for manufacturer test mode
corresponds to buffer empty signaling on A
the bus
The card will expect ACMD or indication C
that the command has been interpreted
as ACMD.
4.9.8 Command Response Timings
All timing diagrams use the following schematics and abbreviations:
S
T
P
E
Z
D
*
CRC
Start bit (= ‘0’)
Transmitter bit (Host = ‘1’, Card = ‘0’)
One-cycle pull-up (= ‘1’)
End bit (=1)
High impedance state (-> = ‘1’)
Data bits
Repetition
Cyclic redundancy check bits (7 bits for command or
response, 16 bits for block data)
Card active
Host active
The difference between the P-bit and Z-bit is that a P-bit is actively driven to HIGH by the card
respectively host output driver, while Z-bit is driven to (respectively kept) HIGH by the pull-up resistors
RCMD respectively RDAT. Actively driven P-bits are less sensitive to noise superposition.
Timing Values
NCR
NID
Min
2
5
NAC
2
NRC
NCC
NWR
NST
8
8
2
2
Max
64
5
10*(TAAC*Fop+1
00*NSAC)
---2
Unit
Clock cycles
Clock cycles
Clock cycles
Clock cycles
Clock cycles
Clock cycles
Clock cycles
The host command and the card response are clocked out with the rising edge of the host clock. The
delay between host command and card response is NCR clock cycles. The following timing diagram is
relevant for host command CMD3 :
44
MultiMediaCardTM
Command Response Timing (Identification Mode)
There is just one Z bit period followed by P bits pushed up by the responding card. The following timing
diagram is relevalent for all host commands followed by a response, except CMD1,CMD2 and CMD3 :
Command Response Timing (Data Transfer Mode)
Card identification and card operation conditions timing
The card identification (CMD2) and card operation conditions (CMD1) timing are processed in the opendrain mode. The card response to the host command starts after exactly NID clock cycles.
Identification Timing (Card Identification Mode)
Last Card Response - Next Host Command Timing
After receiving the last card response, the host can start the next command transmission after at least
NRC clock cycles. This timing is relevant for any host command.
Tming Response End to Next CMD Start (Data Transfer Mode)
Last Host Command - Next Host Command Timing
After the last command has been sent, the host can continue sending the next command after at least
NCC clock periods.
45
MultiMediaCardTM
Tming CMDn End to CMD n+1 Start (All Modes)
In the case the CMDn command was a last identification command (no more response sent by a card),
then the next CMDn+1 command is allowed to follow after at least Ncc+136(the length of the R2
response) clock periods.
Data Access timing
Data transmission starts with the access time delay tAC (which corresponds to NAC), beginning from the
end bit of the data address command. The data transfer stops automatically in case of a data block
transfer or by a transfer stop command.
Data Read Timing (Data Transfer Mode)
Data transfer stop command timing
The card data transmission can be stopped using the stop command. The data transmission stops
immediately with the end bit of the stop command.
Timing of Stop Command (CMD12,Data Transfer Mode)
Single or multiple block write
The host selects one card for data write operation by CMD7. The host sets the valid block length for
block oriented data transfer by CMD16. The host transfers the data with CMD24. The address of the
data block is determined by the argument of this command. This command is responded by the card on
the CMD line as usual. The data transfer from the host starts NWR clock cycles after the card response
was received. The write data have CRC check bits to allow the card to check the transferred data for
transmission errors. The card sends the CRC check information as a CRC status to the host (on the data
line). The CRC status contains the information if the write data transfer was non-erroneous (the CRC
46
MultiMediaCardTM
check did not fail) or not.
In the case of transmission error the card sends a negative CRC status (“101” bin) which forces the host
to retransmit the data. In the case of non-erroneous transmission the card sends a positive CRC status
(“010” bin) and starts the data programming procedure.
Timing of The block Write Command
If the card does not have any more free data receive buffer, the card indicates it by pulling down the data
line to LOW. The card stops pulling down the data line as soon as at least one receive buffer for the
defined data transfer block length becomes free. This signaling does not give any information about the
data write status. This information has to be polled by the status polling command.
Erase block timing
The host must first tag the sector to erase. The tagged sector(s) are erased in parallel by using the
CMD35,36 CMD38. The card busy signaling is also used for the indication of the card erase procedure
duration. In this case the end of the card busy signaling also does mean that the erase of all tagged
sectors has been finished. The host can (also) request the card to send the actual card state using the
CMD13.
47
MultiMediaCardTM
4.9.9 Reset
GO_IDLE_STATE (CMD0) is the software reset command, which sets the MultiMediaCard into the Idle
State independently of the current state. In the Inactive State the MultiMediaCard is not affected by this
command. After power-on the MultiMediaCard is always in the Idle State. After power-on or command
GO_IDLE_STATE (CMD0) all output bus drivers of the MultiMediaCard is in a high-impedance state and
the card will be initialized with a default relative card address (“0x0001”). The host runs the bus at the
identification clock rate fOD generated by a push-pull driver stage (refer to also Chapter “Power on” for
more details).
48
MultiMediaCardTM
4.10 SPI Communication
The SPI mode consists of a secondary communication protocol. This mode is a subset of the
MultiMediaCard protocol, designed to communicate with a SPI channel, commonly found in Motorola’s
(and lately a few other vendors’) microcontrollers. The interface is selected during the first reset
command after power up (CMD0) and cannot be changed once the part is powered on. The SPI
standard defines the physical link only, and not the complete data transfer protocol. The
MultiMediaCard SPI implementation uses a subset of the MultiMediaCard protocol and command set.
It is intended to be used by systems which require a small number of card (typically one) and have
lower data transfer rates (compared to MultiMediaCard protocol based systems). From the application
point of view, the advantage of the SPI mode is the capability of using an off-the-shelf host, hence
reducing the design-in effort to minimum. The disadvantage is the loss of performance of the SPI
system versus MultiMediaCard (lower data transfer rate, fewer cards, hardware CS per card etc.).
While the MultiMediaCard channel is based on command and data bitstreams which are initiated by a
start bit and terminated by a stop bit, the SPI channel is byte oriented. Every command or data block is
built of 8-bit bytes and is byte aligned to the CS signal (i.e. the length is a multiple of 8 clock cycles).
Similar to the MultiMediaCard protocol, the SPI messages consist of command, response and datablock tokens (refer to Chapter “Commands” and Chapter “Responses” for a detailed description). All
communication between host and cards is controlled by the host (master). The host starts every bus
transaction by asserting the CS signal low. The response behavior in the SPI mode differs from the
MultiMediaCard mode in the following three aspects:
- The selected card always responds to the command.
- An additional (8 bit) response structure is used
- When the card encounters a data retrieval problem, it will respond with an error response
(which replaces the expected data block) rather than by a time-out as in the MultiMediaCard mode.
Only single block read write operations are supported in SPI mode. In addition to the command
response, every data block sent to the card during write operations will be responded with a special
data response token. A data block may be as big as one card sector and as small as a single byte.
4.10.1 Mode Selection
The MultiMediaCard wakes up in the MultiMediaCard mode. It will enter SPI mode if the CS signal is
asserted (negative) during the reception of the reset command (CMD0). If the card recognizes that the
MultiMediaCard mode is required it will not respond to the command and remain in the MultiMediaCard
mode. If SPI mode is required the card will switch to SPI and respond with the SPI mode R1 response.
The only way to return to the MultiMediaCard mode is by entering the power cycle. In SPI mode the
MultiMediaCard protocol state machine is not observed. All the MultiMediaCard commands supported
in SPI mode are always available.
4.10.2 Bus Transfer Protection
Every MultiMediaCard token transferred on the bus is protected by CRC bits. In SPI mode, the
MultiMediaCard offers a non protected mode which enables systems built with reliable data links to
exclude the hardware or firmware required for implementing the CRC generation and verification
functions. In the non-protected mode the CRC bits of the command, response and data tokens are still
receiver. The SPI interface is initialized in the non protected mode. The host can turn this option on
and off using the CRC_ON_OFF command (CMD59).
4.10.3 Data Read Overview
49
MultiMediaCardTM
The SPI mode supports single and multiple block read operations (CMD17 and CMD18 in the
MultiMediaCard protocol). The main difference SPI and MultiMediaCard modes is that the data and the
response are both transmitted to the host on the DataOut signal. Therefore the card response to the
STOP_COMMAND may cut-short and replace the last data block (refer to Figure “Read Operation”).
Figure 4-4 Single Block Read Operation
Figure 4-5 Multiple Block Read Operation
The basic unit of data transfer is a block whose maximum size is defined in the CSD (READ_BL_LEN). A
16-bit CRC is appended to the end of each block ensuring data transfer integrity (also refer to chapter
“Cyclic Redundancy Check (CRC)”). CMD17 (READ_SINGLE_BLOCK) initiates a single block read.
CMD18 (READ_MULTIPLE_BLOCK) starts a transfer of several consecutive blocks. Two types of
multiple block read transactions are defined (the host can use either one at any time):
* Open-ended Multiple block read
The number of blocks for the read multiple block operation is not defined. The card willcontinuously
transfer data blocks until a stop transmission command is received.
* Multiple block read with pre-defined block count
The card will transfer the requested number of data blocks, terminate the transaction and return to
transfer state. Stop command is not required at the end of this type of multiple block read, unless
terminated with an error. In order to start a multiple block read with pre-defined block count, the host
must use the SET_BLOCK_COUNT command (CMD23) immediately preceding the
READ_MULTIPLE_BLOCK (CMD18) command. Otherwise the card will start an open-ended multiple
block read which can be stopped using the STOP_TRANSMISSION command.
The host can abort reading at any time, within a multiple block operation, regardless of the its type.
Transaction abort is done by sending the stop transmission command.
In case of a data retrieval error, the card will not transmit any data. Instead, a special data error token will
be sent to the host. Figure “Read Operation-Data Error” shows a data read operation which terminated
50
MultiMediaCardTM
with an error token rather than a data block.
Figure 4-6 Read operation – Data Error
4.10.4 Data Write Overview
The SPI mode supports single block and Multiple block write commands. Upon reception of a valid write
command (CMD24 or CMD25), the card will respond with a response token and will wait for a data block
to be sent from the host. CRC suffix, block length and start address restrictions are identical to the read
operation (see Figure 46). If a CRC error is detected it will be reported in the data-response token and
the data block will not be programmed. Every data block has a prefix of ‘Start Block’ token (one byte).
After a data block has been received, the card will respond with a data-response token. If the data block
has been received without errors, it will be programmed. As long as the card is busy programming, a
continuous stream of busy tokens will be sent to the host (effectively holding the DataOut line low).
Figure 4-6 Single Block Write Operation
In Multiple Block write operation the stop transmission will be done by sending ‘Stop Tran’ token instead
of ‘Start Block’ token at the beginning of the next block.
Two types of multiple block write transactions, identical to the multiple block read, are defined (the host
can use either one at any time):
* Open-ended Multiple block write
51
MultiMediaCardTM
The number of blocks for the write multiple block operation is not defined. The card will continuously
accept and program data blocks until a ‘Stop Tran’ token is received.
* Multiple block write with pre-defined block count
The card will accept the requested number of data blocks and terminate the transaction. ‘Stop tran’ token
is not required at the end of this type of multiple block write, unless terminated with an error. In order to
start a multiple block write with pre-defined block count the host must use the SET_BLOCK_COUNT
command (CMD23) immediately preceding the WRITE_MULTIPLE_BLOCK (CMD25) command.
Otherwise the card will start an open-ended multiple block write which can be stopped using the ‘Stop
tran’ token.
The host can abort writing at any time, within a multiple block operation, regardless of the its type.
Transaction abort is done by sending the ‘Stop tran’ token. If a multiple block write with pre-defined block
count is aborted, the data in the remaining blocks is not defined.
If the card detects a CRC error or a programming error (e.g. write protect violation, out of range, address
misalignment, internal error, etc.) during a multiple block write operation (both types) it will report the
failure in the data-response token and ignore any further incoming data blocks. The host must than abort
the operation by sending the ‘Stop Tran’ token.
Once the programming operation is completed (either successfully or with an error), the host must check
the results of the programming (or the cause of the error if already reported in the data-response token)
using the SEND_STATUS command (CMD13).
If the host sends a ‘Stop Trans’ token after the card received the last data block of a multiple block
operation with pre-defined number of blocks, it will be interpreted as the beginning of an illegal command
and responded accordingly.
While the card is busy, resetting the CS signal will not terminate the programming process. The card will
release the DataOut line (tri-state) and continue with programming. If the card is reselected before the
programming is finished, the DataOut line will be forced back to low and all commands will be rejected.
Resetting a card (using CMD0) will terminate any pending or active programming operations. This may
destroy the data formats on the card. It is in the responsibility of the host to prevent it.
4.10.5 Erase and Write Protect Management
The erase and write protect management procedures in the SPI mode are identical to those of the
MultiMediaCard mode. While the card is erasing or changing the write protection bits of the predefined
sector list, it will be in a busy state and hold the DataOut line low. Figure “No Data Operations”
illustrates a ‘no data’ bus transaction with and without busy signaling.
Figure 4-8 ‘No Data’ Operation
4.10.6 Reading CID/CSD Registers
52
MultiMediaCardTM
Unlike the MultiMediaCard protocol (where the register contents are sent as a command response),
reading the contents of the CSD and CID registers in SPI mode is a simple read-block transaction. The
card will respond with a standard response token (refer to Figure “Read Operation”) followed by a data
block of 16 bytes suffixed with a 16 bit CRC. The data timeout for the CSD command cannot be set to
the card TAAC since this value is stored in the CSD. Therefore the standard response timeout value
(NCR ) is used for read latency of the CSD register
4.10.7 Reset Sequence
The MultiMediaCard requires a defined reset sequence. After power on reset or CMD0 (software reset)
the card enters an idle state. At this state the only legal host command is CMD1 (SEND_OP_COND)
and CMD58 (READ_OCR). In SPI mode, as opposed to MultiMediaCard mode, CMD1 has no
operands and does not return the contents of the OCR register. Instead, the host may use CMD58
(available in SPI mode only) to read the OCR register. Furthermore, it is in the responsibility of the host
to refrain from accessing cards that do not support its voltage range. The usage of CMD58 is not
restricted to the initializing phase only, but can be issued at any time. The host must poll the card (by
repeatedly sending CMD1) until the in-idle-state’ bit in the card response indicates (by being set to 0)
that the card completed its initialization processes and is ready for the next command. The host must
poll the card (by repeatedly sending CMD1) until the ‘in-idle-state’ bit in the card response indicates (by
being set to 0) that the card completed its initialization processes and is ready for the next command.
4.10.8 Error Conditions
Unlike the MultiMediaCard protocol, in the SPI mode the card will always respond to a command. The
response indicates acceptance or rejection of the command. A command may be rejected if it is not
supported (illegal opcode), if the CRC check failed, if it contained an illegal operand, or if it was out of
sequence during an erase sequence.
4.10.9 Memory Array Partitioning
Same as for MultiMediaCard mode.
4.10.10 Card Lock/Unlock
Usage of card lock and unlock commands in SPI mode is identical to MultiMediaCard mode. In both
cases the command response is of type R1b. After the busy signal clears, the host should obtain the
result of the operation by issuing a GET_STATUS command. Please refer to Chapter “Card
lock/unlock operation” for details.
4.10.11 Commands
All the MultiMediaCard commands are 6 bytes long. The command transmission always starts with the
left bit of the bitstring corresponding to the command codeword. All commands are protected by a CRC.
The commands and arguments are listed in Table
Table 4-14 Command bit position
Bit position
Width (bits)
Value
Description
[47]
1
‘0’
start bit
[46]
1
‘1’
transmission bit
[45:40]
6
×
command index
[39:8]
32
×
argument
[7:1]
7
×
CRC7
[0]
1
‘1’
end bit
53
MultiMediaCardTM
The following table provides a detailed description of the SPI bus commands. The responses are
defined in Chapter “Responses”. The Table “Commands and Arguments” lists all MultiMediaCard
commands. A “yes” in the SPI mode colon indicates that the command is supported in SPI mode. With
these restrictions, the command class description in the CSD is still valid. If a command does not
require an argument, the value of this field should be set to zero. The reserved commands are
reserved in MultiMediaCard mode as well. The binary code of a command is defined by the mnemonic
symbol. As an example, the content of the command index field is (binary) ‘000000’ for CMD0 and
‘100111’ for CMD39.
Table 4-15 Commands and Arguments
CMD index
CMD0
CMD1
SPI mode
Yes
Yes
Argument
None
None
Resp
R1
R1
Abbreviation
GO_IDLE_STATE
SEND_OP_COND
CMD2
CMD3
CMD4
CMD5
CMD6
CMD7
CMD8
CMD9
No
No
No
reversed
reversed
No
reversed
Yes
None
R1
SEND_CSD
CMD10
Yes
None
R1
SEND_CID
CMD11
CMD12
CMD13
No
No
Yes
None
R2
SEND_STATUS
asks the selected card to send its
status register.
CMD14
CMD15
CMD16
reversed
No
Yes
[31:0] block length
R1
SET_BLOCKLEN
CMD17
Yes
[31:0]
address
data R1
READ_SINGLE_
BLOCK
CMD18
Yes
[31:0]
address
data R1
READ_MULTIPLE
_BLOCK
selects a block length (in bytes)
for all following block commands
(read and write). *1
reads a block of the size selected
by the SET_BLOCKLEN
command. *2
continuously transfers data blocks
from card to host until interrupted
by a stop command or the
requested number of data blocks
transmitted.
CMD19
CMD20
CMD21…
CMD22
CMD23
reversed
No
reversed
Yes
[31:16] set to 0
R1
[15:0] number of
blocks
SET_BLOCK_CO
UNT
CMD24
Yes
[31:0]
address
data R1b *3
WRITE_BLOCK
Command description
resets the MultiMediaCard
Activates the card’s initialization
process.
asks the selected card to send its
card-specific data (CSD)
asks the selected card to send its
card identification (CID)
Defines the number of blocks
which are going to be transferred
in the immediately exceeding
multiple block read or write
command.
writes a block of the size selected
by the SET_BLOCKLEN
54
MultiMediaCardTM
CMD25
Yes
CMD26
CMD27
No
Yes
CMD28
Yes
[31:0]
address
data R1b
SET_WRITE_
PROT
CMD29
Yes
[31:0]
address
data R1b
CLR_WRITE_
PROT
CMD30
Yes
[31:0] write protect R1
data address
SEND_WRITE_
PROT
CMD31
CMD35
reserved
Yes
[31:0]
address
data R1
TAG_ERASE_
GROUP_START
CMD36
Yes
[31:0]
address
data R1
TAG_ERASE_
GROUP_END
CMD38
Yes
[31:0] stuff bits
R1b
ERASE
CMD39
CMD40
CMD41
CMD42
No
No
reserved
Yes
[31:0] stuff bits
R1b
LOCK/UNLOCK
Used to set/reset the password or
lock/unlock the card. The structure
of the data block is described in
chapter “Card lock/unlock
operation”. The size of the Data
Block is defined by the
SET_BLOCK_LEN command.
CMD43…
CMD57
CMD58
CMD59
reserved
None
[31:0] stuff bits
[0:0] CRC option
R3
R1
READ_OCR
CRC_ON_OFF
Reads the OCR register of a card.
Turns the CRC option on or off. A
‘1’ in the CRC option bit will turn
the option on, a ‘0’ will turn it off.
Yes
Yes
[31:0]
address
data R1
None
R1b
WRITE_MULTIPL
E_BLOCK
command. *4
continuously writes blocks of data
until a “Stop Tran” Token or the
requested number of blocks
received.
PROGRAM_CSD
programming of the
programmable bits of the CSD.
if the card has write protection
features, this command sets the
write protection bit of the
addressed group. The properties
of write protection are coded in the
card specific data
(WP_GRP_SIZE).
if the card has write protection
features, this command clears the
write protection bit of the
addressed group.
if the card has write protection
features, this command asks the
card to send the status of the write
protection bits. *5
sets the address of the first erase
group within a range to be
selected for erase
sets the address of the last erase
group within a continuous range to
be selected for erase
erases all previously selected
sectors
CMD60
No
Notes :
1. The default block length is as specified in the CSD.
2. The data transferred must not cross a physical block boundary unless READ_BLK_MISALIGN is set in
the CSD.
3. R1b : R1 response with an optional trailing busy signal.
4. The data transferred must not cross a physical block boundary unless WRITE_BLK_MISALIGN is set in
the CSD.
55
MultiMediaCardTM
5. 32 write protection bits (representing 32 write protect groups starting at the specified address) followed by
16 CRC bits are transferred in a payload format via the data line. The last (least significant) bit of the
protection bits corresponds to the first addressed group. If the addresses of the last groups are outside the
valid range, then the corresponding write protection bits shall be set to zero.
56
MultiMediaCardTM
4.10.12 Responses
There are several types of response tokens. As in the MultiMediaCard mode, all are transmitted MSB
first:
* Format R1
This response token is sent by the card after every command with the exception of SEND_STATUS
commands. It is one byte long, and the MSB is always set to zero. The other bits are error indications,
an error being signaled by a ‘1’. The structure of the R1 format is given in Figure “R1 Response
Format”. The meaning of the flags is defined as following
- In idle state: The card is in idle state and running the initializing process.
- Erase reset: An erase sequence was cleared before executing because an out of erase sequence
command was received.
- Illegal command: An illegal command code was detected.
- Communication CRC error: The CRC check of the last command failed.
- Erase sequence error: An error in the sequence of erase commands occurred.
- Address error: A misaligned address, which did not match the block length, was used in the
command.
- Parameter error: The command’s argument (e.g. address, block length) was out of the allowed
range for this card.
Figure 4-9 R1 Response Format
Format R1b
This response token is identical to the R1 format with the optional addition of the busy signal. The busy
signal token can be any number of bytes. A zero value indicates card is busy. A non-zero value indicates
the card is ready for the next command.
Format R2
This response token is two bytes long and sent as a response to the SEND_STATUS command. The
format is given in Figure “R2 Response Format”.
57
MultiMediaCardTM
Figure 4-10 R2 Response Format
The first byte is identical to the response R1. The content of the second byte is described in the
following:
- Erase param: An invalid selection, sectors or groups, for erase.
- Write protect violation: The command tried to write a write protected block
- Card ECC failed: Card internal ECC was applied but failed to correct the data.
- CC error: Internal card controller error
- Error: A general or an unknown error occurred during the operation.
- Write protect erase skip | lock/unlock command failed: This status bit has two functions
overloaded. It is set when the host attempts to erase a write protected sector or if a sequence or
password error occurred during card lock/unlock operation.
- Card is locked: Set when the card is locked by the user. Reset when it is unlocked.
Format R3
This response token is sent by the card when a READ_OCR command is received. The response length
is 5 bytes (refer to Figure “R3 Response Format”). The structure of the first (MSB) byte is identical to
response type R1. The other four bytes contain the OCR register.
Figure 4-11 R3 Response Format
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MultiMediaCardTM
Data Response
Every data block written to the card will be acknowledged by a data response token. It is one byte long
and has the following format:
Figure 4-11 Data Response
The meaning of the status bits is defined as follows:
‘010’ - Data accepted
‘101’ - Data rejected due to a CRC error.
‘110’ - Data rejected due to a Write Error.
4.10.13 Data Tokens
Read and write commands have data transfers associated with them. Data is being transmitted or
received via data tokens. All data bytes are transmitted MSB first.
Data tokens are 4 to (N + 3) bytes long (Where N is the data block length set using the
SET_BLOCK_LENGTH Command) and have the following format :
- First byte: Start Byte
Token Type
Transaction Type
7
Bit Position
0
Start Block
Single Block Read
1
1
1
1
1
1
1
0
Start Block
Multiple Block Read
1
1
1
1
1
1
1
0
Start Block
Single Block Write
1
1
1
1
1
1
1
0
Start Block
Multiple Block Write
1
1
1
1
1
1
0
0
Stop Tran
Multiple Block Write
1
1
1
1
1
1
0
1
Figure 4-12 Data Tokens
- Bytes 2 – (N + 1) : User data
- Last two bytes: 16 bit CRC.
4.10.14 Data Error Token
If a read operation fails and the card cannot provide the required data, it will send a data error token
instead. This token is one byte long and has the following format:
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MultiMediaCardTM
Figure 4-13 Data Error Token
The 4 least significant bits (LSB) are the same error bits as in the response format R2.
4.10.15 Clearing Status Bits
As described in the previous paragraphs, in SPI mode, status bits are reported to the host in three
different formats : response R1, response R2 and data error token (the same bits may exist in multiple
response types – e.g. Card ECC failed)
As in the MultiMediaCard mode, error bits are cleared when read by the host, regardless of the
response format. State indicators are either cleared by reading or in accordance with the card state. All
Error/Status bits defined in MultiMediaCard mode, with the exception of the underrun and overrun,
have the same meaning and usage in SPI mode. The following table summarizes the set and clear
conditions for the various status bits :
- Type:
E: Error bit.
S: Status bit.
R: Detected and set for the actual command response.
X: Detected and set during command execution. The host must poll the card by sending status
Command in order to read these bits.
- Clear Condition:
A : According to the card state.
C: Clear by read.
SPI Mode Status Bits
Identifier
Included in
resp
Type
Value
Out of Range
R2
DataErr
ERX
‘0’ = no error
‘1’ = error
Address Error
R1 R2
ERX
‘0’ = no error
‘1’ = error
Erase
Sequence
Error
Error Param
R1 R2
ER
‘0’ = no error
‘1’ = error
R2
EX
Parameter
Error
WP Violation
R1 R2
ERX
R2
ERX
Com CRC
R1 R2
ER
‘0’ = no error
‘1’ = error
‘0’ = no error
‘1’ = error
‘0’ = not
protected
‘1’ = protected
‘0’ = no error
Description
The commands argument was
out of allowed range for this
card.
A address which did not match
the block length was used in the
command.
An error in the sequence of
erase command sequence.
Clear
conditi
on
C
C
C
An error in the parameters of
erase commands occurred.
An error in the parameters of the
command.
Attemp to program a write
protected block.
C
The CRC check of the previous
C
C
C
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MultiMediaCardTM
Error
Illegal
Command
Card ECC
Failed
CC Error
‘1’ = error
‘0’ = no error
‘1’ = error
‘0’ = success
‘1’ = failure
‘0’ = no error
‘1’ = error
‘0’ = no error
‘1’ = error
‘0’ = not
protected
‘1’ = protected
‘0’ = no error
‘1’ = error
R1 R2
ER
R2
DataErr
R2
DataErr
R2
DaraErr
R2
EX
Lock/Unlock
Command
R2
EX
Card is locked
R2
DaraErr
SX
Erase Retest
R1 R2
SR
In Idle State
R1 R2
SR
‘0’ = Card is
ready
‘1’ = protected
CSD Overwrite
R2
EX
‘0’ = no error
‘1’ = error
Error
WP Erase Skip
ERX
ERX
SX
‘0’ = card is
not locked
‘1’ = card is
locked
‘0’ = cleared
‘1’ = set
command failed.
Command not legal for the card
state.
Card internal ECC was applied
but failed to correct the data.
Internal card controller error.
C
C
C
A general or an unknown error
occurred during the operation.
Only partial address space was
erased due to existing WP
blocks.
Sequence or password error
during card lock/unlock
operation.
Card is locked by password.
C
An erase sequence was cleared
before exciting because an
output of erase sequence
command was received.
The card enters the idle state
after power up or reset
command. It will exit this state
and become ready upon
completion of this initialization
procedures.
The host is trying to change the
ROM section, or is trying to
reserve the copy bit (set as
original) or permanent WP bit
(unprotected) or the CSD
register.
C
C
C
A
A
C
4.11 SPI Bus Timing
All timing diagrams use the following schematics and abbreviations:
H
L
X
Z
*
busy
Command
Response
Data block
Signal is high (logical ‘1’)
Transmitter bit (Host = ‘1’, Card = ‘0’)
One-cycle pull-up (= ‘1’)
High impedance state (-> = ‘1’)
Repetition
Busy token
Command token
Response token
Data token
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MultiMediaCardTM
• Host Command to Card Response - Card is ready
Figure 4-14 Timing diagram of command / response transaction, card is ready
The following timing diagram describes the basic command response (no data) SPI transaction.
• Host Command to Card Response - card is busy
The following timing diagram describes the command response transaction for commands when the card
response is of type R1b (e.g. SET_WRITE_PROT and ERASE). When the card is signaling busy, the
host may deselect it (by raising the CS) at any time. The card will release the DataOut line one clock
after the CS going high. To check if the card is still busy, it needs to be reselected by asserting (set to
low) the CS signal.
The card will resume busy signal (pulling DataOut low) one clock after the falling edge of CS.
Figure 4-15 Timing diagram of command / response transaction, card is busy
• Card Response to Host Command
Figure 4-16 Timing diagram: Card response to the next host command
• Single Block Read
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MultiMediaCardTM
Figure 4-17 Timing diagram: Single block read transaction
• Multiple Block Read - Stop Transmission is sent between blocks
The timing for de-asserting the CS signal after the last card response is identical to a standard
command/ response transaction
Figure 4-18 Timing diagram: Multiple block transaction, Stop transmission does not overlap data
• Multiple Block Read - Stop Transmission is sent within a block
In an Open-ended (or host aborted) multiple block read transaction the stop transmission command may
be sent asynchronously to the data transmitted out of the card and may overlap the data block. In this
case the card will stop sending the data and transmit the response token as well. The delay between
command and response is standard NCR Clocks. The first byte, however, is not guaranteed to be all set
to ‘1’. The card is allowed up to two clocks to stop data transmission.
The timing for de-asserting the CS signal after the last card response is identical to a standard
command/ response transaction
Figure 4-19 Timing diagram: Multiple block transaction, Stop transmission overlaps data
• Reading the CSD register
The following timing diagram describes the SEND_CSD command bus transaction. The time-out values
between the response and the data block is NCX (Since the NAC is still unknown).
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MultiMediaCardTM
Figure 4-20 Timing diagram: Read CSD register
• Single Block Write
The host may deselect a card (by raising the CS) at any time during the card busy period (refer to the
given timing diagram). The card will release the DataOut line one clock after the CS going high. To check
if the card is still busy it needs to be reselected by asserting (set to low) the CS signal. The card will
resume busy signal (pulling DataOut low) one clock cycle after the falling edge of CS.
Figure 4-20 Timing Diagram: Single Block Write
• Multiple Block Write
The timimg behaviour of the multiple block write transaction starting from the comamnd up to the first
data block is identical to the single block write. Figure 63 describes the timing between the data blocks of
a multiple block write transaction. Timing of the ‘Stop Tran’ token is identical to a standard data block.
After the “Stop Tran” token is received ny the card, the data on the DataOut line is undefined for one byte
(NBR), after which a Busy token may apear. The host may deselect and reselect the card during every
busy period between the data blocks. Timing for toggling the CS signal is identical to the Single block
write transaction.
Figure 4-21
Timing Diagram: Multiple Block Write
Timing Values
NCS
NCR
NCX
Min
0
1
0
NAC
1
NRC
NWR
NEC
1
1
0
Max
8
8
8
(10/8)*(TAAC*Fo
p+100*NSAC)
8
8
8
Unit
8Clock cycles
8Clock cycles
8Clock cycles
8Clock cycles
8Clock cycles
8Clock cycles
8Clock cycles
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MultiMediaCardTM
NDS
NBR
0
1
8
1
8Clock cycles
8Clock cycles
4.12 Error Handling
MultiMediaCards are defined as error free devices or as devices with a defined maximum bit error rate
(with external error correction circuitry). To correct defects in the memory field of the cards the system
may include error correction codes in the payload data (ECC). This correction is intended to correct
static errors. Additionally two methods of detecting errors generated during the data transfer (dynamic
errors) via a cyclic redundancy check (CRC) are implemented.
4.12.1 Error Correction Code (ECC)
The MultiMediaCard is free of static errors. All errors are covered inside the card, even errors occurring
during the lifetime of MultiMediaCard are covered for the user. The only effect which may be notified by
the end user is, that the overall memory capacity may be reduced by small number of blocks. All flash
handling is done on card, so that no external error correction is needed.
4.12.2 Cyclic Redundancy Check (CRC)
The intention of the ECC method is to protect the MultiMediaCard against permanent storage failures
in the memory field of the card. To protect the data against errors generated during the transport over
the MultiMediaCard bus dynamically, an additional feature is implemented: the cyclic redundancy
check (CRC). Following the MultiMediaCard standard, the MultiMediaCard uses two different CRC
codes to protect the data and the command/response transfer between card and host. Unlike the ECC,
the CRC is intended only to detect transfer errors and not to correct them “on the fly”. When a CRC
error is detected the host has to react. This is normally done by repeating the last command. The first
CRC code is intended to protect the command and response frames. They are also used to
synchronize the data stream.
One CRC is checked in the MultiMediaCard for every command. For each response a CRC is generate
in the MultiMediaCard. Each data block read from the MultiMediaCard will be succeeded by
redundancy bits generated with the second CRC.
Both CRCs are mandatory for the card and the host.
• CRC7
The CRC7 check is used for all commands, for all responses except type R3, and for the CSD and CID
registers. The CRC7 is a 7-bit value and is computed as follows:
generator polynomial: G(x) = x7 + x3 + 1
M(x) = (first bit) * xn + (second bit) * xn-1 +...+ (last bit) * x0
CRC[6...0] = Remainder [(M(x) * x7)/G(x)]
All CRC registers are initialized to zero. The first bit is the most left bit of the corresponding bit string (of
the command, response, CID or CSD). The degree n of the polynomial is the number of CRC protected
bits decreased by one. The number of bits to be protected is 40 for commands and responses (n = 39),
and 120 for the CSD and CID (n = 119).
• CRC16
The CRC16 is used for payload protection in block transfer mode. The CRC check sum is a 16-bit
value and is computed as follows:
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MultiMediaCardTM
generator polynomial: G(x) = x16 + x12 +x5 + 1,
M(x) = (first bit) * xn + (second bit) * xn-1 +...+ (last bit) * x0
CRC[15...0] = Remainder [(M(x) * x16) / G(x)]
All CRC registers are initialized to zero. The first bit is the first data bit of the corresponding block. The
degree n of the polynomial denotes the number of bits of the data block decreased by one (e.g. n =
4095 for a block length of 512 bytes). The generator polynomial G(x) is a standard CCITT polynomial.
The code has a minimal distance d=4 and is used for a payload length of up to 2048 Bytes (n <=
16383).
66