Sony CXD1198AQ Cd-rom subcode decoder Datasheet

CXD1198AQ
CD-ROM Subcode Decoder
For the availability of this product, please contact the sales office.
Description
The CXD1198AQ is a CD-ROM subcode decoder
LSI.
Features
• Real time error correction of subcodes
• Connection possible with DRAM up to 1 MB as
buffer memory
• Automatic generation of sync patterns
• Error pointer buffering function (separated mode,
mixed mode)
• 4 MB/s maximum rate for transferring data with
SCSI control LSI
Applications
CD-ROM drives
Structure
Silicon gate CMOS IC
100 pin QFP (Plastic)
Absolute Maximum Ratings (Ta=25 °C)
• Supply voltage
VCC
–0.5 to +7.0
V
• Input voltage
VI –0.5 to VDD +0.5 V
• Output voltage
VO –0.5 to VDD +0.5 V
• Operating temperature Topr
–20 to +75
°C
• Storage temperature
Tstg –55 to +150
°C
Recommended Operating Conditions
• Supply voltage
VDD
5.0±0.5
• Operating temperature Topr
–20 to +75
V
°C
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
—1—
E92632A78-TE
CXD1198AQ
DMA
Refresh
Control
DDB0-7
81
XDWR 89
XDRD 91
XCAS
XWE
BA0-9
BDB0-7
26
31-39,41
18-25
52 HMDS
H
O
S
T
Pointer
DMA
Control
Pointer
S/P
I
n
t
e
r
f
a
c
e
DDRQ 76
27
Drive
DMA
Control
DDBP 80
XDAC 75
30
DMA Controller
(priority resolver, sequencer)
D
r
i
v
e
88
XRAS
Block Diagram
HOST
DMA
Control
Sync.
Pattern
C
o
n
t
r
o
l
XDCA 92
93
DA0,1
94
FIFO
(10bytes x 2)
71 HINT
72 HINP
I
n
t
e
r
f
a
c
e
55
C
o
n
t
r
o
l
64 XHWR
HBD0-7
62
67 XHAC/
SDRQ
66 HDRQ/
XSAC
63 XHRD
68 XHCS
69
HA0,1
70
XDRS 77
50 XSRS
Error
Corrector
WFCK 45
SCOR 44
SBSO 43
51 XHRS
Subcode
Interface S/P
Control
Subcode
DMA
Control
RAM
48 HCLK
1/2
EXCK 42
Internal
Clock
De-Interleave
13
11
12
95-100
INT
XCS
XRD
XWR
A0-5
1,2,5-10
—2—
14
49
XRST
17
DB0-7
16
INTP
CPU Interface, DMA Control
XCRS
Reset
Control
46
XTL2
47
XTL1
CXD1198AQ
Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
Symbol
DB0
DB1
VDD
VSS
DB2
DB3
DB4
DB5
DB6
DB7
XRD
XWR
XCS
XCRS
VSS
INTP
INT
BDB0
BDB1
BDB2
BDB3
BDB4
BDB5
BDB6
BDB7
XWE
XCAS
VDD
VSS
XRAS
BA0
BA1
BA2
BA3
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
I
I
O
I
O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
O
O
O
O
Description
CPU data bus
CPU data bus
Power supply (+5 V)
GND
CPU data bus
CPU data bus
CPU data bus
CPU data bus
CPU data bus
CPU data bus
Register read strobe negative logic signal in this IC
Register write strobe negative logic signal in this IC
Chip select signal to this IC
Reset negative logic signal to CPU
GND
INT signal polarity control input signal
Interrupt request signal to CPU
Buffer memory data bus
Buffer memory data bus
Buffer memory data bus
Buffer memory data bus
Buffer memory data bus
Buffer memory data bus
Buffer memory data bus
Buffer memory data bus
Strobe negative logic signal for writing in buffer memory
Strobe negative logic signal for column address in buffer memory
Power supply (+5 V)
GND
Strobe negative logic signal for row address in buffer memory
Buffer memory address
Buffer memory address
Buffer memory address
Buffer memory address
—3—
CXD1198AQ
Pin No.
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
Symbol
BA4
BA5
BA6
BA7
BA8
VSS
BA9
EXCK
SBSI
SBSY
WFCK
XTL2
XTL1
HCLK
XRST
XSRS
XHRS
HMDS
VDD
VSS
HDB7
HDB6
HDB5
HDB4
HDB3
HDB2
HDB1
HDB0
XHRD
XHWR
VSS
HDRQ
/XSAC
XHAC
/SDRQ
I/O
O
O
O
O
O
O
O
I
I
I
O
I
O
I
I
O
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
I
Description
Buffer memory address
Buffer memory address
Buffer memory address
Buffer memory address
Buffer memory address
GND
Buffer memory address
Subcode data readout clock output signal to the CXD2500
Subcode data input signal from the CXD2500
Subcode frame sync input signal from the CXD2500
Write frame clock input signal from the CXD2500
Crystal oscillator circuit output
Crystal oscillator circuit input
Crystal 1/2 frequency-divided clock output
Reset negative logic input signal
SCSI bus reset negative logic input signal
Reset negative logic output signal to host
Host mode select input signal
Power supply (+5 V)
GND
Host data bus
Host data bus
Host data bus
Host data bus
Host data bus
Host data bus
Host data bus
Host data bus
Data read strobe signal from host or to SCSI control IC
Data write strobe signal from host or to SCSI control IC
GND
Data request positive logic signal to host or DMA acknowledge negative
logic signal to SCSI control IC
DMA acknowledge negative logic signal from host or data request
positive logic signal from SCSI control IC
—4—
CXD1198AQ
Pin No.
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
Symbol
XHCS
HA0
HA1
HINT
HINP
NC1
NC2
XDAC
DDRQ
XDRS
VDD
VSS
DDBP
DDB7
DDB6
DDB5
DDB4
DDB3
DDB2
DDB1
DDB0
XDWR
VSS
XDRD
I/O
I
I
I
O
I
O
O
O
I
O
92
XDCS
O
93
94
95
96
97
98
99
100
DA1
DA0
A5
A4
A3
A2
A1
A0
O
O
I
I
I
I
I
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
Description
Chip select input signal from host
Host address signal
Host address signal
Interrupt request signal to host
HINT signal polarity control input signal
No connection; leave open.
No connection; leave open.
DMA acknowledge negative logic signal to the CXD1186BQ
Data request positive logic signal from the CXD1186BQ
Reset negative logic signal to the CXD1186BQ
Power supply (+5 V)
GND
Error pointer bus connected with the CXD1186BQ
Data bus connected with the CXD1186BQ
Data bus connected with the CXD1186BQ
Data bus connected with the CXD1186BQ
Data bus connected with the CXD1186BQ
Data bus connected with the CXD1186BQ
Data bus connected with the CXD1186BQ
Data bus connected with the CXD1186BQ
Data bus connected with the CXD1186BQ
Host register write strobe negative logic signal to the CXD1186BQ
GND
Host register read strobe negative logic signal to the CXD1186BQ
Chip select negative logic signal for host register read/write to the
CXD1186BQ
Address signal to the CXD1186BQ
Address signal to the CXD1186BQ
CPU address signal
CPU address signal
CPU address signal
CPU address signal
CPU address signal
CPU address signal
—5—
CXD1198AQ
Electrical Characteristics
DC characteristics
(VDD=5.0±0.5 V, VSS=0 V, Topr=–20 to +75 °C)
Item
TTL input voltage
CMOS input voltage
High level
Low level
High level
Low level
Input current of pull-up input
Input current of pull-down input
CMOS Schmitt
High level
input voltage
Low level
Hysteresis
Output voltage
High level
Low level
Charge pump
High level
output voltage
Low level
Oscillation cell Input
High level
voltage
Low level
Logic threshold
Feedback resistance
Output
High level
voltage
Low level
CMOS input pins
CMOS Schmitt input pins
Pull-up input pins
PUll-down input pin
Charge pump output pins
Oscillation cell input pin
Oscillation cell output pin
:
:
:
:
:
:
:
Symbol
VIH1
VIL1
VIH2
VIL2
IIL
IIH
Vt+
Vt–
Vt+–Vt–
VOH1
VOL1
VOH2
VOL2
VIH3
VIL3
LVth
RFB
VOH3
VOL3
Conditions
Min.
2.2
Typ.
Max.
0.8
0.7VDD
VIL=0 V
VIH=VDD
–40
40
0.8VDD
–100
100
0.3VDD
–240
240
0.2VDD
0.6
IOH1=–2 mA
IOL1=4 mA
IOH2=–6 mA
IOL2=4 mA
VDD–0.8
0.4
VDD–0.8
0.4
0.7VDD
0.3VDD
VIN=VSS or VDD
IOH3=–3 mA
IOL3=3 mA
250 k
VDD/2
VDD/2
1M
2.5 M
VDD/2
Unit
V
V
V
V
µA
µA
V
V
V
V
V
V
V
V
V
V
Ω
V
V
DDRQ, SBSY, SBSI, A5 to 0, XWR, XRD, XCS, INTP
WFCK, XRST
XHCS, HA1, HA0
HMDS
HINT, BA9 to 0
XTL1
XTL2
The characteristics for all other pins follow the TTL input and output voltage items. All bidirectional data buses
are pulled up by standard 25 kΩ resistance.
Input/output capacitance
Item
Input pin
Output pin
I/O pin
Symbol
CIN
COUT
CI/O
VDD=VI=0 V, f=1 MHz
Min.
Typ.
Max.
9
11
11
—6—
Unit
pF
pF
pF
CXD1198AQ
AC characteristics
(Ta=–20 to +75 °C, VDD=5 V±10 %, output load=75 pF, f≤24 MHz)
1. CPU interface
(1) Read
A0 to 5
XCS
tSRC
tHRC
tRRL
XRD
tSRA
DB0 to 7
tHRA
tDRD
tFRD
Item
Address setup time (vs. XRD↓)
Chip select setup time (vs. XRD↓)
Data delay time (vs. XRD↓)
Data float time (vs. XRD↑)
Chip select hold time (vs. XRD↑)
Address hold time (vs. XRD↑)
Low-level XRD pulse width
Symbol
tSRA
tSRC
tDRD
tFRD
tHRC
tHRA
tRRL
Min.
20
0
Typ.
Max.
80
10
3
0
0
100
Unit
ns
ns
ns
ns
ns
ns
ns
(2) Write
A0 to 5
XCS
tSCW
tHWC
tWWL
XWR
tHWA
tSAW
DB0 to 7
tHWD
tSDW
Item
Address setup time (vs. XWR↓)
Chip select setup time (vs. XWR↓)
Data setup time (vs. XWR↓)
Data hold time (vs. XWR↑)
Chip select hold time (vs. XWR↑)
Address hold time (vs. XWR↑)
Low-level XWR pulse width
Symbol
tSAW
tSCW
tSDW
tHWD
tHWC
tHWA
tWWL
—7—
Min.
20
0
40
10
0
0
50
Typ.
Max.
Unit
ns
ns
ns
ns
ns
ns
ns
CXD1198AQ
2. DRAM interface
(1) Read
tRC
tRAS
XRAS
tRCD
tRAD
XCAS
tASR
BA0 to 9
XWE
tCAS
tRAH
tASC
ROW
tCAH
COLUMN
high
tRDD
tCDH
BB0 to 7
(2) Write
tRC
tRAS
XRAS
tRCD
XCAS
tRAD
tASR
BA0 to 9
tCAS
tRAH
ROW
tASC
tCAH
COLUMN
tWCS
tWCH
tDS
tDH
XWE
BB0 to 7
Item
Random read/write cycle time
RAS pulse width
RAS/CAS delay time
CAS pulse width
RAS/column address delay time
Row address setup time
Row address hold time
Column address setup time
Column address hold time
Delay time from RAS
Hold time from CAS
Write command setup time
Write command hold time
Data output setup time
Data output hold time
Symbol
tRC
tRAS
tRCD
tCAS
tRAD
tASR
tRAH
tASC
tCAH
tRDD
tCDH
tWCS
tWCH
tDS
tDH
TW is 1/f here.
—8—
Min.
Typ.
4TW
2TW+5
Max.
2TW+19
TW
TW+5
TW/2+5
10
TW/2
0
TW/2
TW+19
TW/2+17
2TW
0
10
20
10
20
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CXD1198AQ
3. Host interface
(1) Read
HA0 to 5
XHCS
tSRC
tHRC
tRRL
XHRD
tSRA
HDB0 to 7
tHRA
tDRD
tFRD
Item
Address setup time (vs. XHRD↓)
Chip select setup time (vs. XHRD↓)
Data delay time (vs. XHRD↓)
Data float time (vs. XHRD↑)
Chip select hold time (vs. XHRD↑)
Address hold time (vs. XHRD↑)
Low-level XHRD pulse width
Symbol
tSRA
tSRC
tDRD
tFRD
tHRC
tHRA
tRRL
Min.
20
0
Typ.
Max.
70
2
0
0
100
Unit
ns
ns
ns
ns
ns
ns
ns
(2) Write
HA0 to 5
XHCS
tSCW
tHWC
tWWL
XHWR
tHWA
tSAW
HDB0 to 7
tHWD
tSDW
Item
Address setup time (vs. XHWR↓)
Chip select setup time (vs. XHWR↓)
Data setup time (vs. XHWR↓)
Data hold time (vs. XHWR↑)
Chip select hold time (vs. XHWR↑)
Address hold time (vs. XHWR↑)
Low-level XHWR pulse width
Symbol
tSAW
tSCW
tSDW
tHWD
tHWC
tHWA
tWWL
—9—
Min.
20
0
40
10
0
0
50
Typ.
Max.
Unit
ns
ns
ns
ns
ns
ns
ns
CXD1198AQ
4. Host DMA cycle (80-series bus)
(1) Read
HDRQ
tDAR1
tDAR2
XHAC
tSAR
tHRA
tRRL
XHRD
tDRD
tFRD
HDB0 to 7
Item
HDRQ fall time (vs. XHAC↓)
HDRQ rise time (vs. XHAC↑)
XHAC setup time (vs. XHRD↓)
XHAC hold time (vs. XHRD↑)
Low-level XHRD pulse width
Data delay time (vs. XHRD↓)
Data float time (vs. XHRD↑)
Symbol
tDAR1
tDAR2
tSAR
tHRA
tRRL
tDRD
tFRD
Min.
Typ.
Max.
35
55
0
0
100
70
0
Unit
ns
ns
ns
ns
ns
ns
ns
(2) Write
HDRQ
tDAR1
tDAR2
XHAC
tSAW
tHWA
tWWL
XHWR
tSDW
tHWD
HDB0 to 7
Item
HDRQ fall time (vs. XHAC↓)
HDRQ rise time (vs. XHAC↑)
XHAC setup time (vs. XHWR↓)
XHAC hold time (vs. XHWR↑)
Low-level XHWR pulse width
Data setup time (vs. XHWR↓)
Data float time (vs. XHWR↑)
Symbol
tDAR1
tDAR2
tSAW
tHWA
tWWL
tSDW
tHWD
—10—
Min.
0
0
50
40
10
Typ.
Max.
35
55
Unit
ns
ns
ns
ns
ns
ns
ns
CXD1198AQ
5. Host DMA cycle (SCSI bus)
(1) Read
SDRQ
tDDA
tDARS
XSAC
tDAR
tDRA
tRRL
XHRD
tSRD
tHRD
HDB0 to 7
Item
XSAC fall time (vs. SDRQ↓)
HDRQ cycle time (vs. XSAC↑)
XHRD delay time (vs. XSAC↑)
XSAC delay time (vs. XHRD↑)
Low-level XHRD pulse width
Data setup time (vs. XHRD↑)
Data hold time (vs. XHRD↑)
Symbol
tDDA
tDARS
tDAR
tDRA
tRRL
tSRD
tHRD
Min.
Typ.
Max.
TW+31
TW
0
23
2TW
15
5
Unit
ns
ns
ns
ns
ns
ns
ns
TW is 1/f here.
(2) Write
SDRQ
tDDA
tDARS
XSAC
tDAW
tDWA
tWWL
XHWR
tDWD
tFWD
HDB0 to 7
Item
XSAC fall time (vs. SDRQ↓)
SDRQ rise time (vs. XSAC↑)
XHWR delay time (vs. XSAC↓)
XSAC delay time (vs. XHWR↑)
Low-level XHWR pulse width
Data delay time (vs. XHWR↓)
Data float time (vs. XHWR↑)
Symbol
tDDA
tDARS
tDAW
tDWA
tWWL
tDWD
tFWD
TW is 1/f here.
—11—
Min.
Typ.
Max.
TW+31
TW
0
24
2TW
38
10
Unit
ns
ns
ns
ns
ns
ns
ns
CXD1198AQ
6. Drive interface
(1) Read
A0 to 1
XCS
tSCR
XRD
tDAD
DA0 to 1
tDRR2
tDRR1
XDCS, XDRD
tFRD
DDB0 to 7
tDDD
DB0 to 7
(2) Write
XCS
tSCW
XWR
tHWD
DB0 to 1
tDWW2
tDWW1
XDCS, XDWR
tDDD2
tFWD
DDB0 to 7
Item
Drive address delay time (vs. A1 to 0)
Chip select setup time (vs. XRD↓)
Drive read signal delay time (vs. XRD↓)
CPU data delay time (vs. DDB0 to 7)
Drive read signal delay time (vs. XRD↑)
Data float time (vs. XDRD↑)
Chip select setup time (vs. XWR↓)
Drive write signal delay time (vs. XWR↓)
Data delay time (vs. DB0 to 7)
Data hold time (vs. XWR↑)
Drive write signal delay time (vs. XWR↑)
Data float time (vs. XWR↑)
Symbol
tDAD
tSCR
tDRR1
tDDD
tDDR2
tFRD
tSCW
tDWW1
tDDD2
tHWD
tDWW2
tFWD
TW is 1/f here.
—12—
Min.
Typ.
Max.
45
0
35
70
27
0
0
30
70
10
24
TW
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CXD1198AQ
7. Drive DMA cycle
(1) Read
DDRQ
tDDA
tDARS
XDAC
tDAR
tDRA
tRRL
XDRD
tSRD
tHRD
DDB0 to 7
Item
XDAC fall time (vs. DDRQ↑)
DDRQ cycle time (vs. XDAC↑)
XDRD delay time (vs. XDAC↓)
XDAC delay time (vs. XDRD↑)
Low-level XDRD pulse width
Data setup time (vs. XDRD↓)
Data hold time (vs. XDRD↓)
Symbol
tDDA
tDARS
tDAR
tDRA
tRRL
tSRD
tHRD
Min.
Typ.
Max.
TW+32
TW
8
TW–5
0
2TW+10
25
0
Unit
ns
ns
ns
ns
ns
ns
ns
TW is 1/f here.
(2) Write
DDRQ
tDDA
tDAR
XDAC
tDAW
tDWA
tWWL
XDWR
tDDW
tFWD
DDB0 to 7
Item
XDAC fall time (vs. DDRQ↑)
DDRQ rise time (vs. XDAC↑)
XDWR delay time (vs. XDAC↓)
XDAC delay time (vs. XDWR↑)
Low-level XDWR pulse width
Data delay time (vs. XDWR↓)
Data float time (vs. XDWR↑)
Symbol
tDDA
tDARS
tDAW
tDWA
tWWL
tDDW
tFWD
TW is 1/f here.
—13—
Min.
2TW+5
10
Typ.
Max.
TW+32
TW
5
TW
2TW+18
60
Unit
ns
ns
ns
ns
ns
ns
ns
CXD1198AQ
Description of Functions
1. Pin description
1-1. Drive interface (16 pins)
(1)
DDB0 to 7 (Drive Data Bus : bidirectional)
Data bus input/output signals connected with the CXD1186BQ; connected to the HDB0 to 7 pins of the
CXD1186BQ.
(2)
DDBP (Drive Data Pointer : bidirectional)
Error pointer input/output signal connected with the CXD1186BQ; connected to the HDBE pin of the
CXD1186BQ.
(3)
XDCS (Drive Chip Select : negative logic output)
Chip select negative logic output signal for reading/writing host interface registers of the CXD1186BQ;
connected to the XHCS pin of the CXD1186BQ. The host interface registers of the CXD1186BQ are
mapped in 20H to 23H within register address space (00H to 3FH) of this IC.
(4)
XDWR (Drive Write Strobe : negative logic output)
Strobe negative logic output signal for writing data into host interface registers of the CXD1186BQ;
connected to the XHWR pin of the CXD1186BQ.
(5)
XDRD (Drive Read Strobe : negative logic output)
Strobe negative logic output signal for reading data into host interface registers of the CXD1186BQ;
connected to the XHRD pin of the CXD1186BQ.
(6)
DA0, 1 (Drive Address : output)
Address output signals to the CXD1186BQ; connected to the HA0 and 1 pins of the CXD1186BQ.
(7)
DDRQ (Drive DMA Request : positive logic input)
DMA request input signal from the CXD1186BQ; connected to the HDRQ pin of the CXD1186BQ.
(8)
XDAC (Drive Acknowledge : negative logic output)
DMA acknowledge negative logic output signal to the CXD1186BQ in response to DDRQ; connected to
the XHAC pin of the CXD1186BQ.
1-2. Host interface (18pins)
(1)
HDB0 to 7 (Host Data Bus : bidirectional)
Data bus input/output signals connected with host or SCSI control LSI (CXD1185); connected to the D0 to
7 pins for the SCSI control LSI (CXD1185).
(2)
HMDS (Host Mode Select : input)
Input signal for selecting host mode. When connected with Intel 80-series CPU bus, set to low or open;
when connected with the SCSI control LSI (CXD1185), set to high.
—14—
CXD1198AQ
(3)
HDRQ/XSAC (Host DMA Request/SCSI DMA Acknowledge : output)
HMDS = low :
DMA request positive logic signal to host
HMDS = high :
DMA acknowledge negative logic signal to SCSI control LSI (CXD1185)
(4)
XHAC/SDRQ (Host DMA Acknowledge/SCSI DMA Request : input)
HMDS = low :
DMA acknowledge negative logic signal from host
HMDS = high :
DMA request positive logic signal from SCSI control LSI (CXD1185)
(5)
XHWR (Host Write Strobe : negative logic input/output)
HMDS = low :
Data write strobe negative logic input signal from host
HMDS = high :
Data write strobe negative logic output signal to SCSI control LSI (CXD1185);
connected to the /WED pin of SCSI control LSI (CXD1185)
(6)
XHRD (Host Read Strobe : negative logic input/output)
HMDS = low :
Data read strobe negative logic input signal from host
HMDS = high :
Data read strobe negative logic output signal to SCSI control LSI (CXD1185);
connected to the /RED pin of SCSI control LSI (CXD1185)
(7)
XHCS (Host Chip Select : negative logic input)
Pulled up by standard 50 kΩ resistance in the IC.
HMDS = low :
Chip select negative logic input signal of host
HMDS = high :
Not used; set to high or open
(8)
HA0, 1 (Host Address : inputs)
Pulled up by standard 50 kΩ resistance in the IC.
HMDS = low :
Address input signal from host
HMDS = high :
Not used; set to high or open
(9)
HINT (Host Interrupt : output)
Open drain output.
HMDS = low:
Interrupt request signal to host
HMDS = high :
Not used
(10) HINP (Host Interrupt Polarity : input)
Selects the polarity of the HINT signal; set to low when the HINT signal turns to Low active and high when
it turns to High active.
1-3. Buffer Memory Interface (21 pins)
(1)
BDB0 to 7 (Buffer Data Bus : input/output)
Buffer memory data bus signals
(2)
BA0 to 9 (Buffer Address : output)
Buffer memory address signals; the addresses are output to different pins depending on the setting value
of Bits 2 and 3 (Buffer Memory Size) of the Configuration Register: to BA0 to 7 at 64 kB, to BA0 to 8 at
256 kB and to BA0 to 9 at 1 MB.
—15—
CXD1198AQ
(3)
XRAS (Row Address Strobe : negative logic output)
Strobe negative logic output signal for row address in dynamic RAM.
(4)
XCAS (Column Address Strobe : negative logic output)
Strobe negative logic output signal for column address in dynamic RAM.
(5)
XWE (Write Enable : negative logic output)
Strobe negative logic output signal for writing in dynamic RAM.
(Note) Use a DRAM with an access time of 80 ns or less in this IC.
1-4. Subcode Interface (4 pins)
(1)
WFCK (Write Frame Clock : input)
Write frame clock input signal from the CXD2500; connected to the WFCK pin of the CXD2500.
(2)
SBSY (Subcode Sync : positive logic input)
Subcode frame sync input signal from the CXD2500; connected to the SCOR pin of the CXD2500.
(3)
SBSI (Subcode Serial Input : input)
Channel P-W subcode data input signal from the CXD2500; connected to the SBSO pin of the CXD2500.
(4)
EXCK (External Clock : output)
Readout clock signal to the CXD2500 for reading channel P-W subcode data input to SBSI; connected to
the EXCK pin of the CXD2500.
1-5. CPU Interface (19 pins)
(1)
DB0 to 7 (CPU Data Bus : input/output)
8-bit CPU data bus signals
(2)
A0 to 5 (CPU Address : input)
Address input signals for selecting this IC internal register and the host interface registers of the
CXD1186BQ from the CPU
(3)
XWR (CPU Write : negative logic input)
Strobe negative logic input signal for the CPU to write data into this IC internal register and the host
interface registers of the CXD1186BQ.
(4)
XRD (CPU Read : negative logic input)
Strobe negative logic input signal for the CPU to read data from this IC internal register and the host
interface registers of the CXD1186BQ.
—16—
CXD1198AQ
(5)
XCS (Chip Select : negative logic input)
Chip select negative logic input signal for the CPU to read/write data with the register in this IC and the
host interface registers of the CXD1186BQ.
(6)
INT (CPU Interrupt : output)
Interrupt request signal to CPU
(7)
INTP (CPU Interrupt Polarity : input)
Selects the polarity of the INT signal; set to low when the INT signal turns to Low active and high when it
turns to High active.
1-6. Clock Signals (3 pins)
(1)
XTL1 (X’tal1 : input)
(2)
XTL2 (X’tal2 : output)
Inserts a crystal oscillator with a 24 MHZ oscillation frequency between the XTL1 and XTL2 pins.
Alternatively, inputs a 24 MHZ clock signal to the XTL1 pin.
(3)
HCLK (Half Clock : output)
Half frequency divided clock of XTL2.
1-7. Reset Signals (5 pins)
(1)
XRST (Reset : negative logic input)
Power on reset negative logic input signal
(2)
XSRS (SCSI Bus Reset : negative logic input)
SCSI bus reset negative logic input signal
(3)
XCRS (CPU Reset : negative logic output)
Reset negative logic output signal to the CPU; it is low in either of the cases below.
1) XRST = Low
2) XSRS = low
(4)
XHRS (SCSI Reset : negative logic output)
Reset negative logic output signal to the SCSI LSI (CXD1185); it is low in any of the cases below.
1) XRST = Low
2) XSRS = low
3) SCSI reset bit (Bit 2) of reset control register = high
(5)
XDRS (Drive Reset : negative logic output)
Reset negative logic output signal to drive block; it is low either of the cases below.
1) XRST = low
2) Drive reset bit (Bit 1) of reset control register = high
—17—
CXD1198AQ
2. Description of Register Functions
2-1. Write Registers
(1)
Reset Control Register (00H)
Bit 0 : BMM Reset
When this bit is “1”, all the circuits in this IC except for this register and the HCLK frequency
divider circuit are initialized. This bit is automatically set to “0” after the IC has been initialized.
Bit 1 : Drive Reset
When this bit is “1”, the XDRS pin is set to low (activated).
Bit 2 : SCSI Reset
When this bit is “1”, the XSRS pin is set to low (activated).
Bit 3 : Reserved
Bit 4 : Reserved
Bit 5 : Reserved
Bit 6 : Reserved
Bit 7 : Reserved
(2)
DMA Control Register-1 (01H)
Bit 0 : Drive DMA Enable
DMA with the CXD1186BQ is enabled when “1” is written in this bit.
Bit 1 : Drive DMA Source
Selects the transfer direction of DMA with the CXD1186BQ : when “0”, data is transferred from
the buffer memory to the CXD1186BQ and when “1”, from the CXD1186BQ to the buffer
memory. This bit is valid only when Bits 0 is “1”.
Bit 2 : Error Pointer Transfer Enable
When this bit is “1”, the error pointers are written into the buffer memory together with the main
channel data. This bit is valid only when Bits 0 and 1 are both “1”.
Bit 3 : Error Pointer Transfer Mode
Selects the format for writing the error pointers into the buffer memory. When “0”, all the error
pointers starting from the address selected by the Pointer DMA Address Counter are written
separately from the main channel data (separated mode). When “1”, 1 byte of the error pointer
is written immediately after 8-byte of the main channel data (mixed mode). (The value of
Pointer DMA Address Counter is ignored in this case.) This bit is valid only when Bits 0, 1 and
2 are all “1”.
Bit 4 : Sync Pattern Enable
When this bit is “1” a 12-byte dummy sync pattern is written starting with the address selected
by the Drive DMA Address Counter before the data is written from the CXD1186BQ into the
buffer memory. (It is assumed in this case that the error pointer of the sync byte is “0”.) This
bit is valid only when Bits 0 and 1 are both “1”.
Bit 5 : Reserved
Bit 6 : Reserved
Bit 7 : Reserved
—18—
CXD1198AQ
(3)
DMA Control Register-2 (02H)
Bit 0 : Host DMA Enable
DMA with the host is enabled when “1” is written in this bit.
Bit 1 : Host DMA Source
Selects the transfer direction of DMA with the host : when “0”, from the buffer memory to the
host; and when “1”, from the host to the buffer memory. This bit is valid only when Bit 0 is “1”.
Bit 2 : CPU DMA Enable
DMA with the CPU is enabled via the CPU DMA Data Register when “1” is written in this bit.
Bit 3 : CPU DMA Source
Selects the transfer direction of DMA with the CPU : when “0”, data is transferred from the
buffer memory to the CPU DMA Data Register; and when “1”, from the CPU DMA Data
Register to the buffer memory. This bit is valid only when Bit 2 is “1”.
Bit 4: Subcode P-W Decode Enable
Decoding of the channel P-W subcode from the CXD2500 is enabled when this bit is “1”.
Subcodes are decoded inside this IC.
Bit 5 : Subcode P-W DMA Enable
The channel P-W subcodes decoded inside this IC can be written into the buffer memory when
“1”. However, even when this bit is “1”, DMA will commence 3 sectors after Bit 4 has been set
to “1”.
Bit 6 : Subcode P-W ECC Enable
When this bit is “1”, errors in the channel R-W subcodes are corrected. This bit is a valid only
when Bit 4 is “1”.
Bit 7 : Subcode P-W ECC Strategy
When this bit is “1”, double correction is provided while the channel R-W subcodes are
corrected. This bit is valid only when Bit 4 is “1”.
(4)
CPU DMA Data Register (03H)
Data is written into this register when it is written from the CPU into the buffer memory.
(5)
Interrupt Mask Register (04H)
When “1” is written in all the bits of this register and one or more of the interrupt causes corresponding to
these bits (with “1” written) arise, the INT pin is activated. The values of Bits 0 to 5 of this register do not
affect the values of the interrupt status register. Use Bit 6 (Sub Q Interrupt) as the enable register rather
than mask register. When Bit 6 (Sub Q Interrupt) is “1” and a Sub Q interrupt arrives, the values of
Interrupt Status Register are set to “1”.
Bit 0 : Drive DMA Complete
BIt 1 : Subcode P-W DMA Complete
Bit 2 : Host DMA Complete
Bit 3 : Host Chip Reset Issued
BIt 4 : Host Command
BIt 5 : Error Pointer DMA Complete
Bit 6 : Sub Q Interrupt
Bit 7 : Reserved
—19—
CXD1198AQ
(6)
Clear Interrupt Status Register (05H)
When any of respective bits of this register is set to “1”, the corresponding interrupt status is cleared. The
bit is automatically turns to “0” after the interrupt status have been cleared.
Bit 0 : Drive DMA Complete
Bit 1 : Subcode P-W DMA Complete
Bit 2 : Host DMA Complete
Bit 3 : Host Chip Reset Issued
Bit 4 : Host Command
Bit 5 : Error Pointer DMA Complete
Bit 6 : Sub Q Interrupt
Bit 7 : Reserved
(7)
Host Result Register (06H)
This register is utilized to transfer the command execution result to the host when the HMDS pin is low. It
consists of a 10-byte FIFO.
(8)
Host Interface Control Register (07H)
Controls the host interface hardware when the HMDS pin is low. It has the same specifications as the
host interface control register of the CXD1186BQ.
Bit 0 : Host Interrupt #1
This bit value becomes the value of HINTSTS#1 (bit 0) of the Status register on the host side.
Bit 1 : Host Interrupt #2
This bit value becomes the value of HINTSTS#2 (bit 1) of the Status register on the host side.
Bit 2 : Host Interrupt #3
This bit value becomes the value of HINTSTS#3 (bit 2) of the Status register on the host side.
(Note) Once “1” has been written into Bits 0 to 2, the bits will keep at “1” until they are cleared from the
host or the chip is reset. This register cannot be accessed from the CPU to set Bits 0 to 2 from
“1” to “0”. Accordingly, to set any of these bits, it is not necessary to take into consideration the
value of the other bits. Writing “1” into these bits is prohibited when the corresponding Host
Interrupt Status #1 to #3 bits of the Host Interface Status Register are “1”. Therefore, before
writing “1” into these bits, the CPU must read the Host Interface Status Register and confirm
that the corresponding Host Interrupt Status #1 to #3 bits are “0”.
Bit 3 :
Bit 4 :
Bit 5 :
Bit 6 :
Reserved
Reserved
Reserved
Clear Result
The host result register is cleared when “1” is written into this bit. This bit is automatically turns
to “0” when the clearing of the host result register has been completed. There is therefore no
need for the CPU to write “0” again.
Bit 7 : Clear Busy
The busy status bit of the host interrupt status register is cleared when “1” is written into this bit.
This bit is automatically turns to “0” when the clearing of the busy status bit has been
completed. There is therefore no need for the CPU to write “0” again.
—20—
CXD1198AQ
(9)
Drive DMA Address Counter Lower (08H)
(10) Drive DMA Address Counter Middle (09H)
(11) Drive DMA Address Counter Upper (0AH)
These are 20-bit registers for setting the address from which to start the DMA transfer with the
CXD1186BQ. Their values are incremented each time 1 byte has been transferred by DMA.
(12) Drive DMA Transfer Counter Lower (0BH)
(13) Drive DMA Transfer Counter Upper (0CH)
These are 12-bit registers for setting the number of bytes to be transferred by DMA with the CXD1186BQ.
Their values are decremented each time 1 byte has been transferred by DMA.
(14) Error Pointer DMA Address Counter Lower (0DH)
(15) Error Pointer DMA Address Counter Middle (0EH)
(16) Error Pointer DMA Address Counter Upper (0FH)
These are 20-bit registers for setting the address from which to start writing error pointers from the
CXD1186BQ when Bit 3 (pointer transfer mode) of the DMA Control Register is “0”. Their values are
incremented each time 8 bits (1 byte) have been transferred by DMA.
(17) Subcode P-W DMA Address Counter Lower (10H)
(18) Subcode P-W DMA Address Counter Middle (11H)
(19) Subcode P-W DMA Address Counter Upper (12H)
These are 20-bit registers for setting the address from which to start writing the channel P-W subcodes
from the CXD2500. Their values are incremented each time 1 byte (1 symbol) has been transferred by
DMA.
(20) Host DMA Address Counter Lower (13H)
(21) Host DMA Address Counter Middle (14H)
(22) Host DMA Address Counter Upper (15H)
These are 20-bit registers for setting the address from which to start the data transfer by DMA with the
host. Their values are incremented each time 1 byte has been transferred by DMA.
(23) Host DMA Transfer Counter Lower (16H)
(24) Host DMA Transfer Counter Upper (17H)
These are 16-bit registers for setting the number of bytes transferred by DMA with the host. Their values
are decremented each time 1 byte has been transferred by DMA.
—21—
CXD1198AQ
(25) CPU DMA Address Counter Lower (18H)
(26) CPU DMA Address Counter Middle (19H)
(27) CPU DMA Address Counter Upper (1AH)
These are 20-bit registers for setting the address from which to start the data transfer by DMA with the
CPU. Their values are incremented each time 1 byte has been transferred by DMA.
(28) Configuration Register (1BH)
Bit 0 : CDL 3 × Series
This bit is set to “1” when connected to the CDL30 or 35 series LSI.
Bit 1 : Packet Mode
When this bit is “0”, transfers the decoded data in 4 packs to the DRAM for each subcode sync;
when it is “1”, transfers the decoded data in 4 packs starting from the pack prior to the fifth pack
to the DRAM for each subcode sync.
Bit 2 : Buffer Memory Size 1
Bit 3 : Buffer Memory Size 2
Select the buffer memory size : 64 kB with (Bit 3, Bit 2) = (0, 0), 256 kB with (0, 1) and 1 MB
with (1, x).
Bit 4 : Error Pointer Write Data
Sets the error pointer (DDBP) value when data is transferred by DMA from the buffer memory
to the CXD1186BQ.
Bit 5 : HCLK Disable Mode
The HCLK output remains low when this bit is “1”. When “0”, a clock signal with half the
frequency of XTL2 is output from the HCLK output.
Bit 6 : Reserved
Bit 7 : Reserved
(29) Drive Command Register (20H)
The command register for the host interface of the CXD1186BQ is mapped in the register address space
of this IC.
(30) Drive Parameter Register (21H)
The parameter register for the host interface of the CXD1186BQ is mapped in the register address space
of this IC.
(31) Drive Write Data Register (22H)
The write data register for the host interface of the CXD1186BQ is mapped in the register address space
of this IC.
(32) Drive Control Register (23H)
The control register for the host interface of the CXD1186BQ is mapped in the register address space of
this IC.
—22—
CXD1198AQ
2-2. Read Registers
(1)
BMM Status Register (00H)
Bit 0 : Reset Condition
This bit is set to “1” when XSRS is low and “0” when XRST is low or when “1” is written into Bit
0 (BMM Reset) of the Reset Control Register. It is used for determining whether the CPU
which was reset externally was the SCSI bus or power-on.
Bit 1 : CPU Buffer Read Ready
This bit is set to “1” when the 1-byte data read from the buffer memory is provided in the CPU
DMA Data Register. It returns to “0” when the data in the CPU DMA Data Register is read.
Bit 2 : CPU Buffer Write Ready
This bit is set to “0” when1-byte data is written into the CPU MDA Data Register. It is set to “1”
when the data in the CPU DMA data register is written into the buffer memory.
Bit 3 : Pointer Status Flag
This bit is set to “1” when one or more error pointers were set in 1 block of data transferred
from the CXD1186BQ. It is cleared to “0” by setting a value in the Drive DMA Transfer
Counter.
Bit 4 : Subcode ECC Status #0
Indicates the results of the error correction in channel R-W subcode pack #0. It is set to “1”
when uncorrectable data errors occur.
Bit 5 : Subcode ECC Status #1
Indicates the results of the error correction in channel R-W subcode pack #1. It is set to “1”
when uncorrectable data errors occur.
Bit 6 : Subcode ECC Status #2
Indicates the results of the error correction in channel R-W subcode pack #2. It is set to “1”
when uncorrectable data errors occur.
Bit 7 : Subcode ECC Status #3
Indicates the results of the error correction in channel R-W subcode pack #3. It is set to “1”
when uncorrectable data errors occur.
(2)
DMA Status Register-1 (01H)
The setting values of DMA Control Register-1 can be read from this register.
Bit 0 : Drive DMA Enable
Bit 1 : Drive DMA Source
Bit 2 : Pointer Transfer Enable
Bit 3 : Pointer Transfer Mode
Bit 4 : Sync Pattern Enable
Bit 5 : Reserved
Bit 6 : Reserved
Bit 7 : Reserved
—23—
CXD1198AQ
(3)
DMA Status Register-2 (02H)
The setting values of DMA Control Register-2 can be read from this register.
Bit 0 : Host DMA Enable
Bit 1 : Host DMA Source
Bit 2 : CPU DMA Enable
Bit 3 : CPU DMA Source
Bit 4 : Reserved
Bit 5 : Subcode P-W DMA Enable
Bit 6 : Subcode P-W ECC Enable
Bit 7 : Subcode P-W ECC Strategy
(4)
CPU DMA Data Register (03H)
The data read from the buffer memory by DMA with the CPU is written into this register.
(5)
Interrupt Status Register (04H)
The values of this register’s bits indicate the corresponding interrupt statuses respectively.
Bit 0 : Drive DMA Complete
This is set to “1” when data transfer by DMA with the CXD1186BQ is completed.
Bit 1 : Subcode P-W DMA Complete
This is set to “1” when the channel P-W subcodes have been written into the buffer memory.
Bit 2 : Host DMA Complete
This is set to “1” when data transfer by DMA with the host is completed.
Bit 3 : Host Chip Reset Issued
This is set to “1” when the host writes “1” into Bit 7 (Chip Reset Bit) of the Host Control Register
and this IC is reset.
Bit 4 : Host Command
This is set to “1” when the host writes a 1 byte command into the Host Command Register.
Bit 5 : Pointer DMA Complete
This is set to “1” when the DMA transfer of pointers is completed.
Bit 6 : Sub Q Interrupt
This is set to “1” if the falling edge of the SBSY pin (connected to the SCOR pin of the
CXD2500) is detected when “1” has been written into Bit 6 (Sub Q Interrupt) of the Interrupt
Mask Register.
Bit 7 : Reserved
(6)
Host Command Register (05H)
This register is used to know the commands from the host when the HMDS pin is low.
(7)
Host Parameter Register (06H)
This register is used to know the command parameters from the host when the HMDS pin is low. It
consists of a 10-byte FIFO.
—24—
CXD1198AQ
(8)
Host Interface Status Register (07H)
This register is used to know the status of the host interface hardware when the HMDS pin is low. It has
the same specifications as the Host Interface Control Register of the CXD1186BQ.
Bit 0 : Host Interrupt Status #1
This bit turns to “1” when the CPU writes “1” into host interrupt #1 (Host Interface Control
Register Bit 0). It is set to “0” when the host writes “1” into CLRINT #1 (Control Register Bit 0).
This bit is used to monitor the interrupt status to the host.
Bit 1 : Host Interrupt Status #2
This bit turns to “1” when the CPU writes “1” into host interrupt #2 (Host Interface Control
Register Bit 1). It is set to “0” when the host writes “1” into CLRINT #2 (Control Register Bit 1).
This bit is used to monitor the interrupts status to the host.
Bit 2 : Host Interrupt Status #3
This bit turns to “1” when the CPU writes “1” into host interrupt #3 (Host Interface Control
Register Bit 2). It is set to “0” when the host writes “1” into CLRINT #3 (Control Register Bit 2).
This bit is used to monitor the interrupts status to the host.
Bit 3: Parameter Read Ready
When this bit is “1”, it indicates that the Parameter Register of the host is not empty and
parameter data can be read from the CPU. When “0”, the Parameter Register is empty.
Bit 4: Parameter Full
When this bit is “1”, it indicates that the Parameter Register of the host is full.
Bit 5: Result Write Ready
When this bit is “1”, it indicates that the Host Result Register is not full and result data can be
written from the CPU. When “0”, the Host Result Register is full and the CPU cannot write the
result data into the register.
Bit 6: Result Empty
When this bit is “1”, it indicates that the Host Result Register is empty.
Bit 7: Busy Status
This bit has the same value as Bit 7 of the Host Status Register. It is set to “1” when the host
writes a command in the Command Register. It is set to “0” when the CPU writes “1” into the
Clear Busy Bit of the Host Interface Control Register.
(9)
Drive DMA Address Counter Lower (08H)
(10) Drive DMA Address Counter Middle (09H)
(11) Drive DMA Address Counter Upper (0AH)
Indicate the Drive DMA Address Counter values.
(12) Drive DMA Transfer Counter Lower (0BH)
(13) Drive DMA Transfer Counter Upper (0CH)
Indicate the Drive DMA Transfer Counter values.
(14) Error Pointer DMA Address Counter Lower (0DH)
(15) Error Pointer DMA Address Counter Middle (0EH)
—25—
CXD1198AQ
(16) Error Pointer DMA Address Counter Upper (0FH)
Indicate the Error Pointer DMA Address Counter values.
(17) Subcode P-W DMA Address Counter Lower (10H)
(18) Subcode P-W DMA Address Counter Middle (11H)
(19) Subcode P-W DMA Address Counter Upper (12H)
Indicate the Subcode P-W DMA Address Counter values.
(20) Host DMA Address Counter Lower (13H)
(21) Host DMA Address Counter Middle (14H)
(22) Host DMA Address Counter Upper (15H)
Indicate the Host DMA Address Counter values.
(23) Host DMA Transfer Counter Lower (16H)
(24) Host DMA Transfer Counter Upper (17H)
Indicate the Host DMA Transfer Counter values.
(25) CPU DMA Address Counter Lower (18H)
(26) CPU DMA Address Counter Middle (19H)
(27) CPU DMA Address Counter Upper (1AH)
Indicate the CPU DMA Address Counter values.
(28) Drive Status Register (20H)
The Status Register for the host interface of the CXD1186BQ is mapped in the register address space of
this IC.
(29) Drive Result Register (21H)
The Result Register for the host interface of the CXD1186BQ is mapped in the register address space of
this IC.
(30) Drive Read Data Register (22H)
The Read Data Register for the host interface of the CXD1186BQ is mapped in the register address
space of this IC.
(31) Drive FIFO Status Register (23H)
The FIFO Status Register for the host interface of the CXD1186BQ is mapped in the register address
space of this IC.
—26—
CXD1198AQ
Write Register
Reset Control Register (00H)
bit7
bit6
bit5
bit4
bit3
bit2
SCSI IC
Reset
DMA Control Register - 1 (01H)
bit7
bit6
bit5
bit1
Drive
Reset
bit0
BMM
Reset
bit4
bit3
bit2
bit1
bit0
Sync
Pattern
Enable
Pointer
Transfer
Mode
Pointer
Transfer
Enable
Drive
DMA
Source
Drive
DMA
Enable
bit4
bit3
bit2
bit1
bit0
Subcode
Decode
Enable
CPU
DMA
Source
CPU
DMA
Enable
Host
DMA
Source
Host
DMA
Enable
bit4
bit3
bit2
bit1
bit0
D5
D4
D3
D2
D1
D0
Interrupt Mask Register (04H)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Host
Command
Host Chip
Reset
Issued
Host
DMA
Complete
Subcode
DMA
Complete
Drive
DMA
Complete
bit4
bit3
bit2
bit1
bit0
Pointer
DMA
Complete
Host
Command
Host Chip
Reset
Issued
Host
DMA
Complete
Subcode
DMA
Complete
Drive
DMA
Complete
bit5
bit4
bit3
bit2
bit1
bit0
D5
D4
D3
D2
D1
D0
DMA Control Register - 2 (02H)
bit7
bit6
bit5
Subcode
ECC
Strategy
Subcode
ECC
Enable
Subcode
DMA
Enable
CPU DMA Data Register (03H)
bit7
bit6
bit5
D7
D6
Sub Q
interrupt
Pointer
DMA
Complete
Clear Interrupt Register (05H)
bit7
bit6
bit5
Sub Q
interrupt
Host Result Register (06H)
bit7
bit6
D7
D6
—27—
CXD1198AQ
Host Interface Control Register (07H)
bit7
bit6
bit5
bit2
bit1
bit0
Host
Interrupt
#3
Host
Interrupt
#2
Host
Interrupt
#1
bit3
bit2
bit1
bit0
A4
A3
A2
A1
A0
Drive DMA Address Counter Middle (09H)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A12
A11
A10
A9
A8
Drive DMA Address Counter Upper (0AH)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A19
A18
A17
A16
bit3
bit2
bit1
bit0
A4
A3
A2
A1
A0
Drive DMA Transfer Counter Upper (0CH)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A11
A10
A9
A8
bit3
bit2
bit1
bit0
A3
A2
A1
A0
Clear
Busy
bit4
bit3
Clear
Result
Drive DMA Address Counter Lower (08H)
bit7
bit6
bit5
bit4
A7
A15
A6
A14
A5
A13
Drive DMA Transfer Counter Lower (0BH)
bit7
bit6
bit5
bit4
A7
A6
A5
Pointer DMA Address Counter Lower (0DH)
bit7
bit6
bit5
bit4
A7
A6
A5
A4
—28—
CXD1198AQ
Pointer DMA Address Counter Middle (0EH)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A12
A11
A10
A9
A8
Pointer DMA Address Counter Upper (0FH)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A19
A18
A17
A16
bit3
bit2
bit1
bit0
A3
A2
A1
A0
bit3
bit2
bit1
bit0
A11
A10
A9
A8
bit3
bit2
bit1
bit0
A19
A18
A17
A16
bit4
bit3
bit2
bit1
bit0
A4
A3
A2
A1
A0
Host DMA Address Counter Middle (14H)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A11
A10
A9
A8
A15
A14
A13
Subcode P-W DMA Address Counter Lower (10H)
bit7
bit6
bit5
bit4
A7
A6
A5
A4
Subcode P-W DMA Address Counter Middle (11H)
bit7
bit6
bit5
bit4
A15
A14
A13
A12
Subcode P-W DMA Address Counter Upper (12H)
bit7
bit6
bit5
bit4
Host DMA Address Counter Lower (13H)
bit7
bit6
bit5
A7
A15
A6
A14
A5
A13
A12
—29—
CXD1198AQ
Host DMA Address Counter Upper (15H)
bit7
bit6
bit5
bit3
bit2
bit1
bit0
A19
A18
A17
A16
bit4
bit3
bit2
bit1
bit0
A4
A3
A2
A1
A0
bit4
bit3
bit2
bit1
bit0
A12
A11
A10
A9
A8
bit4
bit3
bit2
bit1
bit0
A4
A3
A2
A1
A0
CPU DMA Address Counter Middle (19H)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A12
A11
A10
A9
A8
CPU DMA Address Counter Upper (1AH)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A19
A18
A17
A16
bit4
bit3
bit2
bit1
bit0
Error
Pointer
Write Data
Buffer
Memory
Size 2
Buffer
Memory
Size 1
Host DMA Transfer Counter Lower (16H)
bit7
bit6
bit5
A7
A6
A5
Host DMA Transfer Counter Upper (17H)
bit7
bit6
bit5
A15
A14
A13
CPU DMA Address Counter Lower (18H)
bit7
bit6
bit5
A7
A15
A6
A14
A5
A13
Configuration Register (1BH)
bit7
bit6
bit5
HCLK
Disable
Mode
bit4
—30—
Packet
Mode
CDL3X
Series
CXD1198AQ
Drive Command Register (20H)
Drive Parameter Register (21H)
Drive Write Data Register (22H)
Drive Control Register (23H)
Internal RAM-1 Write (30H)
Internal RAM-2 Write (31H)
Test Register (35H)
bit7
bit6
bit5
Reset
Signal
Sync
bit4
bit3
HCLK
Reset
—31—
TSTE
bit2
TSTD
bit1
bit0
REF
Block
Test
SUB
Block
Test
CXD1198AQ
Read register
BMM Status Register (00H)
bit7
bit6
bit5
bit4
bit3
Subcode
ECC
Status #1
Subcode
ECC
Status #0
Pointer
Status
Flag
bit4
bit3
bit2
bit1
bit0
Sync
Pattern
Enable
Pointer
Transfer
Mode
Pointer
Transfer
Enable
Drive
DMA
Source
Drive
DMA
Enable
bit4
bit3
bit2
bit1
bit0
CPU
DMA
Source
CPU
DMA
Enable
Host
DMA
Source
Host
DMA
Enable
bit4
bit3
bit2
bit1
bit0
D5
D4
D3
D2
D1
D0
Interrupt Status Register (04H)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Host
Command
Host Chip
Reset
Issued
Host
DMA
Complete
Subcode
DMA
Complete
Drive
DMA
Complete
bit4
bit3
bit2
bit1
bit0
D5
D4
D3
D2
D1
D0
Host Parameter Register (06H)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
D4
D3
D2
D1
D0
Subcode
ECC
Status #3
Subcode
ECC
Status #2
DMA Status Register - 1 (01H)
bit7
bit6
bit5
DMA Status Register -2 (02H)
bit7
bit6
bit5
Subcode
ECC
Strategy
Subcode
ECC
Enable
Subcode
DMA
Enable
CPU DMA Data Register (03H)
bit7
bit6
bit5
D7
D6
Sub Q
interrupt
Pointer
DMA
Complete
Host Command Register (05H)
bit7
bit6
bit5
D7
D7
D6
D6
D5
—32—
bit2
bit1
CPU Buffer CPU Buffer
Write
Read
Ready
Ready
bit0
Reset
Condition
CXD1198AQ
Hot Interface Status Register (07H)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Parameter
Full
Parameter
Read
Ready
Host
Interrupt
#3
Host
Interrupt
#2
Host
Interrupt
#2
bit3
bit2
bit1
bit0
A4
A3
A2
A1
A0
Drive DMA Address Counter Middle (09H)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A12
A11
A10
A9
A8
Drive DMA Address Counter Upper (0AH)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A19
A18
A17
A16
bit3
bit2
bit1
bit0
A4
A3
A2
A1
A0
Drive DMA Transfer Counter Upper (0CH)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A11
A10
A9
A8
bit3
bit2
bit1
bit0
A3
A2
A1
A0
Busy
Status
Result
Empty
Result
Write
Ready
Drive DMA Address Counter Lower (08H)
bit7
bit6
bit5
bit4
A7
A15
A6
A14
A5
A13
Drive DMA Transfer Counter Lower (0BH)
bit7
bit6
bit5
bit4
A7
A6
A5
Pointer DMA Address Counter Lower (0DH)
bit7
bit6
bit5
bit4
A7
A6
A5
A4
—33—
CXD1198AQ
Pointer DMA Address Counter Middle (0EH)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A12
A11
A10
A9
A8
Pointer DMA Address Counter Upper (0FH)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A19
A18
A17
A16
bit3
bit2
bit1
bit0
A3
A2
A1
A0
bit3
bit2
bit1
bit0
A11
A10
A9
A8
bit3
bit2
bit1
bit0
A19
A18
A17
A16
bit4
bit3
bit2
bit1
bit0
A4
A3
A2
A1
A0
Host DMA Address Counter Middle (14H)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A11
A10
A9
A8
A15
A14
A13
Subcode P-W DMA Address Counter Lower (10H)
bit7
bit6
bit5
bit4
A7
A6
A5
A4
Subcode P-W DMA Address Counter Middle (11H)
bit7
bit6
bit5
bit4
A15
A14
A13
A12
Subcode P-W DMA Address Counter Upper (12H)
bit7
bit6
bit5
bit4
Host DMA Address Counter Lower (13H)
bit7
bit6
bit5
A7
A15
A6
A14
A5
A13
A12
—34—
CXD1198AQ
Host DMA Address Counter Upper (15H)
bit7
bit6
bit5
bit3
bit2
bit1
bit0
A19
A18
A17
A16
bit4
bit3
bit2
bit1
bit0
A4
A3
A2
A1
A0
bit4
bit3
bit2
bit1
bit0
A12
A11
A10
A9
A8
bit4
bit3
bit2
bit1
bit0
A4
A3
A2
A1
A0
CPU DMA Address Counter Middle (19H)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A12
A11
A10
A9
A8
CPU DMA Address Counter Upper (1AH)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
A19
A18
A17
A16
Host DMA Transfer Counter Lower (16H)
bit7
bit6
bit5
A7
A6
A5
Host DMA Transfer Counter Upper (17H)
bit7
bit6
bit5
A15
A14
A13
CPU DMA Address Counter Lower (18H)
bit7
bit6
bit5
A7
A15
A6
A14
A5
A13
bit4
—35—
CXD1198AQ
Drive Status Register (20H)
Drive Result Register (21H)
Drive Read Data Register (22H)
Drive FIFO Status Register (23H)
Internal RAM-1 Read (30H)
Internal RAM-2 Read (31H)
Internal LOG Read (32H)
Internal ALOG Read (33H)
Internal FPAL Read (34H)
—36—
CXD1198AQ
3. DMA Functions
3-1. Overview
This IC accepts requests for DMA to the buffer memory from the six DMA channels of drive
(CXD1186BQ), error pointer (CXD1186BQ), subcode P-W (CXD2500), host CPU and buffer memory
(DRAM) refresh. Then, it generates memory cycle signals for an external buffer memory (DRAM), and
executes DMA cycles.
3-2. DMA Address Counters
The DMA address counters hold the buffer memory addresses of each DMA channel, which are divided
into row and column addresses as the memory addresses of the external DRAM buffer memory in
accordance with the Configuration Register Bits 2 and 3 (buffer memory size) setting, and output the
addresses from BA0 to 9. The address counter values for each DMA channel are incremented each time
the DMA cycle is executed. The DMA address counter values of five channels (except the buffer memory
refresh channel ) can be set or read from the CPU.
3-3. DMA Transfer Counters
The DMA transfer counters hold the number of bytes to be transferred for each DMA channel, they are
decremented each time a DMA cycle is executed, and DMA is completed when their values reach zero.
The values of the DMA transfer counters for the drive (CXD1186BQ) and host DMA channels can be set
or read from the CPU but the initial setting of the DMA transfer counter for the subcode P-W (CXD2500)
channel is fixed and its value cannot be set or read from the CPU. The CPU and buffer memory refresh
channels do not have DMA transfer counters.
3-4. Drive DMA Channel
(1)
Execution of DMA cycle
DMA transfer for the drive DMA channel is requested by making the DDRQ signal activated, and the DMA
cycle is executed.
(2)
Procedure of control from CPU
Described below is the procedure of control exercised by this IC when DMA transfer for the drive DMA
channel is to be executed.
♦ The number of bytes to be transferred is written into the drive DMA transfer counter.
♦ The head address of the buffer memory to be accessed is written into the drive DMA address
counter (and also into the error pointer DMA address counter if necessary).
♦ “1” is written into Bit 0 (drive DMA enable) of DMA Control Register-1, and the prescribed values
are written into Bits 1 to 4. (This causes the DMA cycle execution to start.)
♦ When the DMA transfer of the number of bytes written into the drive DMA transfer counter is
completed, Interrupt Status Register Bit 0 (drive DMA complete) is set to “1”. Also, the drive DMA
transfer register is zero, and the drive DMA address counter holds the address following the buffer
memory address in which data was last transferred by DMA.
—37—
CXD1198AQ
(3)
Variations of DMA transfer for drive DMA channel
Depending on the settings of Bits 0 to 4 of DMA Control Register-1, options such as the addition of a
dummy sync pattern or DMA transfer of error pointers can be selected for the DMA transfer of the drive
DMA channel, as shown in the table below.
Bit 0
0
Bit 1
×
Bit 2
×
Bit 3
×
Bit 4
×
1
0
×
×
×
1
1
0
×
0
1
1
0
×
1
Addition of dummy sync pattern at head of above data
1
1
1
0
0
Writing of main channel data and error pointers from the CXD1186BQ
into buffer memory (separated mode)
1
1
1
0
1
Addition of dummy sync pattern at head of above data
1
1
1
1
0
Writing of main channel data and error pointers from the CXD1186BQ
into buffer memory (mixed mode)
1
1
1
1
1
Addition of dummy sync pattern at head of above data
(4)
Description of DMA transfer
DMA transfer prohibited
DMA transfer of main channel data and error pointers from buffer
memory to the CXD1186BQ
Writing of main channel data from the CXD1186BQ into buffer
memory
DMA transfer of pointers
When DMA transfer from the CXD1186BQ (9-bit data) into the buffer memory (8-bit data), the error
pointers sent together with the drive main channel data are serial-to-parallel converted in the IC and the
data is written one byte at a time into the buffer memory. When executing DMA for error pointers,
therefore, the number of drive DMA transfer must be a multiple of 8.
When DMA transfer from the buffer memory (8-bit data) to the CXD1186BQ (9-bit data), the value
selected by Bit 4 (error pointer write data) of the Configuration Register is used as the error pointer, and
only the number of transferring bytes set in the drive DMA transfer counter is output from the DDBP pin
along with the main channel data.
When DMA transfer from the CXD1186BQ (9-bit data) into the buffer memory (8-bit data), 8-byte of the
main channel data are first written, and then 8-bit of the error pointer corresponding to this data is written
as 1-byte data. As described below, there are two modes for writing the main channel data and error
pointers.
♦ Separated mode
The main channel data and error pointers are separated and written in different locations on the
buffer memory. The write head address for each is set in the drive DMA address counter and
pointer DMA address counter. The number of transferring bytes of the main channel data is set in
the drive DMA transfer counter.
♦ Mixed mode
8-byte of the main channel data and 1 byte of the error pointer are repeated in this sequence and
written in a continuous buffer memory address. The write head address is set in the drive DMA
address counter, and the pointer DMA address counter value is ignored. The number of bytes
transferred of the main channel data is set in the drive DMA transfer counter.
—38—
CXD1198AQ
(5)
Writing of dummy sync patterns into buffer memory
If Bit 4 (sync pattern enable) of DMA Control Register-1 is set to “1” when DMA transfer from the
CXD1186BQ to the buffer memory, a 12-byte dummy sync pattern is generated in the IC and written into
the buffer memory prior to data transfer from the CXD1186BQ. Following the dummy sync pattern from
the buffer memory address set in the drive DMA address counter, the data from the CXD1186BQ is
written into the buffer memory. The number of bytes for data transferred from the CXD1186BQ must be
set in the drive DMA transfer counter. (Exclude the number of dummy sync patterns.)
3-5. Subcode P-W DMA Channel
When Bit 5 (subcode P-W DMA enable) of DMA Control Register-2 is set to “1”, the channel P-W
subcodes decoded in this IC are written into the buffer memory. The number of bytes transferred is fixed
(at 96).
(1)
Execution of DMA cycle
DMA transfer of the subcode P-W DMA channel is requested by the timing generator signal used to read
the subcode P-W in this IC, and the DMA cycle is executed.
(2)
Procedure for controlling IC from CPU
Described below is the procedure for controlling this IC when subcode P-W channel DMA is to be
executed.
♦ Write “1” into Bit 4 (subcode P-W decode enable) of DMA Control Register-2 to execute DMA of
the subcode P-W channel. As a result, subcode P-W decoding commences.
♦ Write the head address of the buffer memory to be directly accessed into the Subcode P-W DMA
Address Counter.
♦ Write “1" into Bit 5 (subcode P-W DMA enable) of DMA Control Register-2. (As a result, the DMA
cycle is executed when the decoding has been completed.)
♦ When the DMA transfer of 96 bytes is completed, Bit 1 (subcode P-W DMA complete) of the
Interrupt Status Register is set to “1”. The Subcode P-W DMA Address Counter holds the
address value following the buffer memory address which was last transferred by DMA.
(3)
Subcode P-W error correction
Subcode P-W errors are corrected when “1” is written into Bit 6 (subcode P-W ECC enable) of DMA
Control Register-2 at the same time as “1” is written into Bit 5 (subcode P-W DMA enable of the same
register). In this case, Bit 1 (subcode P-W DMA complete) of the Interrupt Status Register-1 is set to “1”
when all the operations up to the DMA transfer have been completed. Double correction is performed
when “1” is written into Bit 7 (subcode P-W ECC strategy) of DMA Control Register-2.
(4)
Error discrimination
Upon completion of the DMA transfer, the presence or absence of errors in each of 4 packs is written into
Bits 4 to 7 of the BMM Status Register. These statuses are valid for about 13 ms after DMA transfer is
completed.
—39—
CXD1198AQ
3-6. Host DMA Channel
(1)
Execution of DMA cycle
DMA transfer of the host DMA channel is requested when the HDRQ signal becomes activated, and the
DMA cycle is executed. For further details, refer to chapter 4.
(2)
Procedure for controlling IC from CPU
Described below is the procedure for controlling this IC when DMA transfer of the host DMA channel is
executed.
♦ Write the number of bytes transferred into the Host DMA Transfer Counter.
♦ Write the head address of the buffer memory, to which the data is transferred by DMA, into the
Host DMA Address Counter.
♦ Write “1” into Bit 0 (host DMA enable) of DMA Control Register-2 and “0” or “1” into Bit 1 (host
DMA source) depending on the transfer direction. (When these are written, the DMA cycle
execution commences.)
♦ When the DMA transfer of the number of bytes written into the Host DMA transfer counter is
completed, Bit 3 (host DMA complete) of the Interrupt Status Register is set to “1”. Also, the Host
DMA Transfer Register is zero, and the Host DMA address counter holds the value of the address
following the buffer memory address which was last transferred by DMA.
3-7. CPU DMA Channel
(1)
Execution of DMA cycle
DMA transfer of the CPU DMA channel is requested by read/write with the CPU DMA Data Register, and
the DMA cycle is executed.
(2)
Procedure for controlling IC from CPU
Described below is the procedure for controlling this IC when DMA transfer of the CPU DMA channel is
executed.
♦ Write the head address of the buffer memory, to which the data is transferred by DMA, into the
CPU DMA Address Counter.
♦ Write “1” into Bit 3 (CPU DMA enable) of DMA Control Register-2 and “0” or “1” into Bit 4 (CPU
DMA source) depending on the direction of transfer. (When these are written, the DMA cycle
execution commences.)
♦ In reading data from the buffer memory, Bit 1 (CPU buffer read ready) of the BMM Status Register
is set to “1” when the data read from the buffer memory is written into the CPU DMA Data
Register. Therefore, first check this status and then read the data from the CPU DMA Data
Register. When the data is read from the CPU DMA Data Register, Bit 1 returns to “0" and the
CPU DMA Address Register is incremented. When the next data is written into the CPU DMA
Data Register from the buffer memory, the Bit is again set to “1”. Check this status and then read
the next data from the CPU DMA Data Register.
♦ In writing data into the buffer memory, first check that Bit 2 (CPU buffer write ready) of the BMM
Status Register is “1” and then write the data into the CPU DMA Data Register. Bit 2 (CPU buffer
write ready) is set to “0” when the data is written in the CPU DMA Data Register but when this
data is written into the buffer memory, it returns to “1” and the CPU DMA Address Register is
incremented. Check that Bit 2 is set to “1” again and then write the next data into the CPU DMA
Data Register.
—40—
CXD1198AQ
4. Host Interfaces
4-1. Overview
The CXD1198AQ can be connected with the Intel 80-series host bus or SCSI control LSI (CXD1185, etc.)
as the host interface. The selection can be made by the HMDS pin as follows.
When connecting with the Intel 80-series host bus, input a low logic level to the HMDS pin or leave it
open; when connecting with the SCSI control LSI, input a high logic level to the HMDS pin.
Except for the fact that the XTC pin is not supported, the host interface specifications of this IC are the
same as those for the CXD1186BQ.
4-2. When connecting with the Intel 80-series host bus
When connecting this IC with the Intel 80-series host bus, input a low logic level to the HMDS pin or leave
it open. Fig. 4-1 shows and example of the connection.
(1)
Commands/statuses transfer between host and CPU
The host can access each of the four write and read registers using the HA0, HA1, XHCS, XHRD and
XHWR pins. The DMA transfer mode is also supported by the WRDATA and RDDATA registers and,
regardless of the HA0, HA1 and XHCS pin values, the registers are selected by the XHAC, XHRD and
XHWR pins, and DMA transfer is conducted between the host and buffer memory. The Parameter
Register and Result Register are 10-byte FIFO registers.
Inputting a low logic level to both the XHAC and XHCS pins is prohibited at the same time.
∗ Write registers
♦ Command register (00H)
The host writes commands into this register. When it does this, and interrupt request is applied
from this IC to the CPU. Bit assignment and function attribution is performed by the drive control
program.
♦ Parameter register (01H)
The host writes into this register command parameters required for the CPU to execute the
commands. This is a 10-byte FIFO register.
♦ WRDATA (write data) register (02H)
This register is for writing data into the buffer memory from the host. Data can be written in either
the I/O mode or DMA mode.
♦ Control register (03H)
This register is for the direct control of the hardware in this IC by the host.
Bit 0 to 2 : INTCLR#1 to 3 (interrupt clear #1 to 3)
By writing “1” into any of these bits, the corresponding interrupt status is cleared. These bits
automatically return to “0” after the interrupt status interrupt is cleared. So, there is no need to
write “0” again.
Bit 3 to 5 : ENINT #1 to 3 (enable interrupt #1 to 3)
By writing “1” into any of these bits, the corresponding interrupt status is enabled. The host can
also read the values of these bits from the Status register.
Writing “1" into a bit is prohibited when its corresponding interrupt status is high. Therefore,
before writing “1” into any of these bits, the host must read the Status register and check its
interrupt status.
—41—
CXD1198AQ
Bit 6 : CLRPRM (clear parameter)
The Parameter register can be cleared by writing “1” into this bit. This bit automatically returns to
“0” after the Parameter register is cleared. So, there is no need to write “0” again.
Bit 7 : CHPRST (chip reset)
This IC is internally initialized by writing “1” into this bit. This bit automatically returns to “0” upon
completion of the initializing. So, there is no need to write “0” again. An interrupt request can be
generated to the CPU by writing “1” into this bit.
∗ Read registers
♦ Status register (00H)
This register is for the host to read the statuses in this IC.
Bit 0 to 2 : INTSTS #1 to 3 (interrupt status #1 to 3)
The values of these bits correspond to that of Bits 0 to 2 in the CPU’s Host Interface Control
Register respectively. When each bit is “1”, an interrupt request is generated to the host provided
that the corresponding interrupt of the bit is enabled.
Bit 3 to 5 : ENINTST #1 to 3 (enable interrupt status #1 to 3)
The values of these bits correspond to that of Bits 3 to 5 in the control register.
Bit 6 : Data request status
This bit has the same value as the HDRQ pin, and it indicates that the IC has requested the host
for buffer memory data transfer. When transferring data in the I/O mode, access the WRDATA or
RDDATA registers after the host has checked that this bit is “1”.
Bit 7 : Busy status
This bit is set to “1” by the host writing a command in the Command register. It is set to “0” by the
CPU writing “1” into the clear busy bit of the Host Interface Control Register.
♦ Result register (01H)
The host reads the results after the command execution from this register. This is a 10-byte FIFO
register.
♦ RDDATA (read data) register (02H)
This register is for the host to read the data from the buffer memory. Data can be read in the I/O
mode or DMA mode.
♦ FIFO status register (03H)
This register is for the host to read the status of the parameter register or the host result register.
Bit 0 : Parameter write ready
When this bit is “1”, it indicates that the Parameter register is not full and the host can write
parameter data.
Bit 1 : Parameter empty
When this bit is “1”, it indicates that the Parameter register is empty.
Bit 2 : Result read ready
When this bit is “1”, it indicates that the Host Result register is not empty and the host can read
result data.
Bit 3 : Result full
When this it is “1”, it indicates that the Host Result register is full.
Bit 4 to 7 : Reserved
—42—
CXD1198AQ
Write registers
Command Register (00H)
bit7
bit6
D7
D6
Parameter Register (01H)
bit7
bit6
D7
D6
Write Data Register (02H)
bit7
bit6
D7
D6
Control Register (03H)
bit7
bit6
Chip
Reset
Clear
FIFO
bit5
bit4
bit3
bit2
bit1
bit0
D5
D4
D3
D2
D1
0
bit5
bit4
bit3
bit2
bit1
bit0
D5
D4
D3
D2
D1
0
bit5
bit4
bit3
bit2
bit1
bit0
D5
D4
D3
D2
D1
0
bit5
bit4
bit3
bit2
bit1
bit0
INTCLR
#3
INTCLR
#2
INTCLR
#2
bit2
bit1
bit0
ENINT
#3
ENINT
#2
ENINT
#1
Read registers
Status Register (00H)
bit7
bit6
Busy
Status
Data Request
Status
Result Register (01H)
bit7
bit6
D7
D6
Read Data Register (02H)
bit7
bit6
D7
D6
FIFO Status Register (03H)
bit7
bit6
bit5
bit4
bit3
ENINTST
#3
ENINTST
#2
ENINTST
#1
bit5
bit4
bit3
bit2
bit1
bit0
D5
D4
D3
D2
D1
0
bit5
bit4
bit3
bit2
bit1
bit0
D5
D4
D3
D2
D1
0
bit5
bit4
bit3
bit2
bit1
bit0
Result Read
Parameter
Empty
Result
Full
—43—
INTSTS
#3
Ready
INTSTS
#2
INTSTS
#1
Parameter
Write Ready
CXD1198AQ
(2)
Host and CPU control procedure
Fig. 4-2 shows and example of the host and CPU control procedure. In this example, the host gets to
know the interrupt status by polling the Status register.
(3)
Data transfer between host and buffer memory
This IC contains 2 × 8-bit FIFO registers (WRDATA, RDDATA), and data can be transferred at 4 MB/s
maximum.
(3-1) Data transfer in DMA mode
Data is transferred between the host and this IC by means of handshaking using the HDRQ/XSAC and
XHAC/SDRQ pins.
The HDRQ/XSAC pin outputs the HDRQ signal requesting data transfer from the IC to the host and the
XHAC/SDRQ becomes the corresponding acknowledge signal XHAC.
♦ Data transfer from host to buffer memory (host DMA source bit = “1”)
When the host DMA enable bit is “1” while FIFO is not full and the XHAC pin is high, this IC sets
the HDRQ pin high. When the acknowledge signal returns from the host, the HDRQ pin is set
low. Data from the host is retrieved in this IC at the XHAC pin rising. The data retrieved is written
in sequence into the addresses of the buffer memory selected by the Host Address Counter
Register.
♦ Data transfer from buffer memory to host (host DMA source bit = “0”)
When the host DMA enable bit is “1”, the data in the address of the buffer memory selected by the
Host Address Counter Register is retrieved in this IC. When the buffer memory data is retrieved,
this IC sets the HDRQ pin high if the XHAC pin is “1”. When the acknowledge signal returns from
the host, the HDRQ pin is set low. While this pin is low, this IC outputs the data retrieved from the
buffer memory to host bus HDB0 to 7.
(3-2) Data transfer in the I/O mode
The host can transfer data with the buffer memory by writing or reading the WRDATA or RDDATA
registers. In this case, the control of this IC by the CPU is not different from that in the DMA mode. Fig.
4-3 shows the host control flow when data is transferred between the host and buffer memory in the I/O
mode.
(3-3) Completion of data transfer
There are two following methods to complete data transfer.
• By using the Host Transfer Counter. (This is the usual method.)
• By setting the host DMA enable bit to “0”.
♦ When using the Host Transfer Counter
When transferring data using the Host Transfer Counter, the CPU should perform the following
operations prior to the data transfer.
· Write the number of bytes for data transferred into the Host Transfer Counter.
· Write the data transfer direction (host DMA source) and “1” into the host DMA enable bit.
When these are written, data transfer commences.
The Host Transfer Counter is decremented each time data is written into FIFO. When its value is
reduced to zero, further data is not written into FIFO. When all the FIFO data is read out, the host
DMA complete status (Interrupt Status Register Bit 2) sets on.
—44—
CXD1198AQ
♦ When the host DMA enable bit is set to “0”
Data transfer is stopped when the host DMA enable bit is set to “0” during actual transfer. Then
the transfer of data between this IC and the host or buffer memory may be suspended so that the
values of the Host Address Counter and Host Transfer Counter after suspension cannot be
guaranteed.
In this case, the host DMA complete status does not set on.
(4)
Procedure for controlling IC from CPU
Described below is the procedure for controlling this IC when DMA transfer of the host DMA channel is to
be executed.
♦ Write the number of bytes transferred into the Host DMA Transfer Counter.
♦ Write the head address of the buffer memory, to which the data is transferred by DMA, into the
Host DMA Address Counter.
♦ Write “1” into Bit 0 (host DMA enable) of DMA Control Register-2 and “0” or “1” into Bit 1 (host
DMA source), depending on the transfer direction. (When these are written, the DMA cycle
execution commences.)
♦ When the DMA transfer of the number of bytes written into the Host DMA Transfer Counter is
completed, Bit 3 (host DMA complete) of the Interrupt Status Register is set to to “1”. Also, the
Host DMA Transfer Register is zero, and the Host DMA Address Counter holds the value of the
address following the buffer memory address which was last transferred by DMA.
4-3. When connecting this IC with the SCSI control LSI
When connecting this IC to the SCSI control LSI, input a high logic level to the HMDS pin. Fig. 4-4 shows
an example of the connections.
(1)
Data transfer between SCSI control LSI and buffer memory
Data is transferred between the SCSI control LSI and this IC by means of handshaking using the
HDRQ/XSAC and XHAC/SDRQ pins.
The XHAC/SDRQ pin outputs the SDRQ signal requesting data transfer from the SCSI control LSI to this
IC, and the HDRQ/XSAC pin becomes the corresponding acknowledge signal XSAC.
♦ Data transfer from SCSI control LSI to buffer memory (host DMA source bit = “1”)
When the host DMA enable bit is “1”, and the SDRQ signal is input, this IC outputs a low-level
signal from the XSAC pin provided that FIFO is not full. The data is retrieved in this IC at the
XHWR pin rising. The data retrieved is written in sequence into the addresses of the buffer
memory selected by the host address counter.
♦ Data transfer from buffer memory to SCSI control LSI (host DMA source bit = “0”)
When the host DMA enable bit is “1”, the data in the address of the buffer memory selected by the
Host Address Counter is retrieved in this IC. When, with the buffer memory data retrieved, the
SDRQ signal X is input, this IC outputs a low-level signal from the XSAC pin and, while this pin is
low, the IC outputs the data retrieved from the buffer memory to host bus HDB0 to 7.
—45—
CXD1198AQ
(2)
Completion of data transfer
For details on how to complete the data transfer, refer to section “(3-3) Completion of data transfer” on
the previous page.
(3)
Procedure for controlling IC from CPU
When data is to be transferred between the SCSI control LSI and buffer memory, the procedure for
controlling this IC from the CPU is the same as for the Intel 80-series host bus described in the previous
section. Refer to “(4) Procedure for controlling IC from CPU” in the previous section.
—46—
CXD1198AQ
BDB0-7
XWE
XCAS
XRAS
BSBP
BDB0-7
BA0-12
XMOE
XMWR
BA0-9
Buffer Memory
64k/256k/1M Byte D-RAM
Buffer Memory
8k × 9Bit S-RAM
DDB0-7, P
HDB0-7
HBD0-7, P
XCRS
DB0-7
A0-5
XRD
XWR
DB0-7
A0-3
XRD
XWR
XHWR
XHRD
XHCS
HA0, 1
HINT
HMDS
XHRS
WFCK
SCOR
SBSO
EXCK
CXD1186BQ
XCS
INT
CXD1198AQ
XDAC
DDRQ
XDWR/XDRD
XDCS/DA0, 1
XDRS
CXD2500
WFCK
SCOR
SBSO
EXCK
Reset
DB0-7
A0-5
XRD
XWR
INT1
INT2
XCS1
XCS2
Address
Decoder
A6-15
Fig. 4-1 Example of connection with Intel 80-series host bus
—47—
Control
CPU
To 80-series HOST BUS
XHAC
HDRQ
XHWR/XHRD
XHCS/DA0, 1
XRST
XCS
INT
DATA
BCLK
LRCK
C2PO
CXD1198AQ
START
Interrupt Processing
Read Interrupt Status
Read Status Register
Busy Status ?
Host Command
=“1” ?
YES
NO
YES
NO
Read Host Command
Write Parameter
Read Host Parameter
Write Command
Interrupt Clear
Command Start
Read Status Register
Return
Interrupt Status
NO
YES
Command
Completed
?
Read Result
YES
Write Result
END
Write Host Interface
Control Register
Fig. 4-2 Example of commands/statuses transfer between host and CPU
—48—
NO
CXD1198AQ
START
n=N
N : Number of bytes transferred
Read Status Register
DREQSTS
= “1” ?
NO
YES
Read Data or Write Data
n = n–1
n=0?
NO
YES
END
Fig. 4-3 Example of data transfer control in I/O mode
—49—
CXD1198AQ
BDB0-7
BA0-9
XWE
XCAS
XRAS
Buffer Memory
64k/256k/1M Byte D-RAM
HDB0-7
XDAC
DDRQ
XDWR/XDRD
XDCS/DA0, 1
XDRS
XHAC/SDRQ
XDRQ/XSAC
XHWR
XHRD
CXD1198AQ
WFCK
SCOR
SBSO
EXCK
CXD1185
DB0-7
A0-5
XRD
XWR
Refer to FIg. 4-1 for the example of
connection on the CXD1186BQ and
CXD2500 sides.
INT1
XCS1
XCS2
Address
Decoder
A6-15
Fig. 4-4 Example of connection with SCSI control LSI
—50—
Control
CPU
IRQ
DB0-7
A0-3
XCS
XWE
XRD
XCRS
XRST
DB0-7
A0-5
XRD
XWR
HMDS
XHRS
HCLK
XSRS
XCS
INT
To CXD1186BQ or CXD2500
DDB0-7, P
CXD1198AQ
Package Outline
Unit : mm
100PIN QFP (PLASTIC)
23.9 ± 0.4
+ 0.4
20.0 – 0.1
+ 0.1
0.15 – 0.05
80
51
+ 0.4
14.0 – 0.1
17.9 ± 0.4
15.8 ± 0.4
50
81
A
31
100
1
0.65
30
+ 0.15
0.3 – 0.1
0.24
+ 0.2
0.1 – 0.05
+ 0.35
2.75 – 0.15
M
0° to 15°
DETAIL A
0.8 ± 0.2
(16.3)
0.15
PACKAGE STRUCTURE
PACKAGE MATERIAL
EPOXY RESIN
SONY CODE
QFP-100P-L01
LEAD TREATMENT
SOLDER PLATING
EIAJ CODE
QFP100-P-1420
LEAD MATERIAL
42/COPPER ALLOY
PACKAGE MASS
1.7g
JEDEC CODE
—51—