ETC PM7385?

PM7385 FREEDM-84A672
DATASHEET ERRATA
ISSUE 6
FREEDM-84A672 REVISION C DEVICE ERRATA
11
:24
:11
PM
PMC-2000954
r,
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ep
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be
FREEDM-84A672
20
02
PM7385
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,1
REVISION C DEVICE ERRATA
ISSUE 6
April, 2002
PMC-Sierra, Inc.
105 - 8555 Baxter Place, Burnaby, BC Canada V5A 4V7 604 415 6000
PM7385 FREEDM-84A672
DATASHEET ERRATA
ISSUE 6
FREEDM-84A672 REVISION C DEVICE ERRATA
PM
PMC-2000954
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:11
TABLE OF CONTENTS
Introduction ..........................................................................................................1
1.1. Device Identification ..................................................................................1
1.2. Reference..................................................................................................1
2.
FREEDM-84A672 Revision C Functional Deficiency List ....................................2
2.1. Dropped data on unchannelised DS3 SBI SPE. .......................................3
2.2. TEMUX loss of frame may cause data corruption.....................................4
2.3. Following recovery from receive FIFO overrun events, truncated data
transfers may occur on the receive Any-PHY bus. ..............................................5
2.4. Incorrect T1 tributary CAS Phase Information may be generated on SBI
Bus. 7
2.5. Delay Required After Writes to SBI Master Configuration Registers.........8
2.6. Reset of SBI Tributaries are Required if C1FP is Sourced Externally (such
as from a TEMUX) ...............................................................................................9
3.
Documentation Errors ........................................................................................10
3.1. Addition of “SBI INSERT MIN_THR and MAX_THR for T1”. ..................11
3.2. Figure 32 in Datasheet has Signals Labeled Incorrectly .........................12
3.3. PROV and DELIN bits in Register 0x204 are Write-Only........................13
3.4. 7BIT, INVERT, CRC[1], and CRC[0] bits in Register 0x208 are Write-Only
14
3.5. Addition of “SBI INSERT MIN_THR and MAX_THR for E1”. ..................14
3.6. New Patents Issued ................................................................................15
4.
Contacting PMC-Sierra ......................................................................................17
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02
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1.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMER’S INTERNAL USE.
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PM7385 FREEDM-84A672
DATASHEET ERRATA
ISSUE 6
FREEDM-84A672 REVISION C DEVICE ERRATA
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PMC-2000954
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Introduction
:24
1.
20
Device Identification
tem
be
r,
1.1.
02
11
In this document, Section 2 lists the known functional errata for revision C of PM7385
FREEDM-84A672 and Section 3 lists errors found in Issue 6 of the FREEDM-84A672
datasheet (PMC-1990114).
,1
9S
ep
The information contained in Section 2 relates to Revision C of PM7385 FREEDM84A672 only. The device revision code is marked at the end of the Wafer Batch
Code on the face of the device (as shown in Figure 1.1). PM7385 FREEDM-84A672
Revision C is packaged in a 352-pin Ball Grid Array (SBGA).
ay
Figure 1.1: PM7385 FREEDM-84A672 Branding Format.
hu
rsd
Pin A1 Reference
nT
PMC Logo
io
TM
liv
ett
FREEDM
84A672
Part Number
Wafer Batch Code
Assembly Date Code
Country of Origin
Not to Scale
1.2.
•
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inv
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fo
PM7385-BI
C
C
Myyww
PHILIPPINES
FREEDM Logo
Reference
PMC-1990114, FREEDM-84A672 Long Form Data Sheet, Issue 6.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMER’S INTERNAL USE
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PM7385 FREEDM-84A672
DATASHEET ERRATA
ISSUE 6
FREEDM-84A672 REVISION C DEVICE ERRATA
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PMC-2000954
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FREEDM-84A672 Revision C Functional Deficiency List
:24
2.
20
02
11
This section lists the known functional deficiencies for Revision C of FREEDM84A672 (as of the publication date of this document). For each deficiency, the known
work-around and the operating constraints, with and without the work-around, are
also described.
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Please report any functional deficiencies not covered in this document to PMC-Sierra.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMER’S INTERNAL USE
2
PM7385 FREEDM-84A672
DATASHEET ERRATA
ISSUE 6
FREEDM-84A672 REVISION C DEVICE ERRATA
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Dropped data on unchannelised DS3 SBI SPE.
:24
2.1.
02
11
Description:
tem
be
r,
20
When the TCAS672 block is configured to transmit a DS-3 on one of the SBI SPE’s,
there is a small probability that data bytes may be dropped from the transmit data
stream.
ep
Workarounds:
9S
Carrying out the following procedure during configuration will eliminate this problem:
ay
,1
1. Place the SPE into T1 mode (SBI_MODE = 1 in register 440, 444 or 448 hex)
rsd
2. Wait at least 125 us
nT
hu
3. Place the SPE into DS-3 mode (SBI_MODE = 0 in register 440, 444 or 448 hex)
ett
io
Performance with workaround:
fo
liv
With the extra configuration step, FREEDM-84A672 works correctly.
ef
uo
Performance without workaround:
Do
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inv
Bytes of transmit data may be dropped during transfer to the SBI bus.
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DATASHEET ERRATA
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FREEDM-84A672 REVISION C DEVICE ERRATA
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TEMUX loss of frame may cause data corruption.
:24
2.2.
02
11
Description:
tem
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When a link on the TEMUX loses frame, corrupted pointer information may be sent
over the SBI Bus to the FREEDM, resulting in data corruption on the FREEDM.
ep
When frame synchronization returns, the TEMUX will automatically recover and begin
transmitting data to the FREEDM. However, due to the corrupted pointer information,
the FREEDM may not recover and clear the data corruption in all cases.
,1
9S
Workarounds:
hu
rsd
ay
The tributaries affected by the loss of framing must be disabled in the EXSBI then
reenabled following recovery of framing synchronization on the TEMUX.
io
nT
Performance with workaround:
liv
ett
With the affected links disabled then reenabled after each failure, the FREEDM84A672 works correctly.
uo
fo
Performance without workaround:
Do
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db
yV
inv
ef
The affected links may experience data corruption.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMER’S INTERNAL USE
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PM7385 FREEDM-84A672
DATASHEET ERRATA
ISSUE 6
FREEDM-84A672 REVISION C DEVICE ERRATA
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Following recovery from receive FIFO overrun events, truncated data
transfers may occur on the receive Any-PHY bus.
11
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2.3.
20
02
Description:
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When outputting packets on the receive Any-PHY bus, the FREEDM-84A672 will
normally transfer bursts of data containing ((XFER+1)*16) bytes, where XFER is a
value between 0 and 15 configurable on a per-channel basis, or alternatively, bursts
of data containing fewer bytes but including an end of packet. The Any-PHY interface
is intended to operate in such a manner at all times, so that a downstream device
may assume that any data transfer, in which REOP is not asserted is of a fixed
length.
liv
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Following a receive FIFO overrun, however, the FREEDM-32A672 implements an
automatic FIFO healing mechanism. The FREEDM-32A672 attempts to drain the
overrun FIFO as quickly as possible and, once the FIFO has emptied, resets the
internal FIFO control logic. While the FIFO is undergoing the healing operation,
however, the FIFO control logic does not guarantee that all ‘non-EOP’ transfers on
the Any-PHY bus are of the programmed fixed length. As a consequence, the
FREEDM-32A672 may output a burst of data containing (n*16) bytes of data, where n
is less than (XFER+1), but which does not include an end of packet.
db
yV
inv
ef
uo
fo
After outputting the shortened burst, FREEDM-32A672 will tristate its outputs driving
the receive Any-PHY bus. The downstream device, expecting all non-EOP bursts to
be of length ((XFER+1)*16) bytes, will therefore read a number of non-existant words.
This will manifest itself as extra bytes inserted into the HDLC packet. Depending on
what termination has been applied to the Any-PHY bus (pull-ups, pull-downs, etc.),
these extra bytes may be all zeros, all ones, or a repetition of the last word output by
the FREEDM-32A672 on the Any-PHY bus before it tristated its outputs.
Do
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It is important to note that the FIFO healing mechanism referred to above can take
some time to complete. (The time to heal is proportional to the difference in speed
between the FIFO reader and FIFO writer.) As a result, there may be some delay
between a FIFO overrun being reported and a truncated burst being output on the
Any-PHY bus.
Workarounds:
There are 4 possible independent workarounds:
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PM7385 FREEDM-84A672
DATASHEET ERRATA
ISSUE 6
FREEDM-84A672 REVISION C DEVICE ERRATA
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Set the receive path XFER to 0. All transfers not containing an end of packet
will then be 16 bytes and thus of constant length. This workaround may not be
suitable in high bandwidth systems, especially if multiple FREEDM-84A672s
are sharing an Any-PHY bus.
ii)
Attach a pull-down resistor to the RVAL output and monitor this signal to detect
truncated data transfers. The pull-down resistor should be of such strength
that the non-driven state of the Rx Any-PHY Bus can be detected within 16
RXCLK cycles.
iii)
Attach a pull-up resistor to the RERR output and monitor this signal to detect
truncated data transfers. The pull-up resistor should be of such strength that
the non-driven state of the Rx Any-PHY Bus can be detected within 16 RXCLK
cycles. RERR is always logic 0 when the FREEDM-84A672 is outputting data
on the Any-PHY bus, except when REOP is asserted. If a pull-up resistor is
attached to RERR, a truncated transfer will be indicated by RERR = 1 and
REOP = 0. The downstream device can take the appropriate action such as
discarding the packet.
iv)
Attach pull-down or pull-up resistors to the RXDATA[15:0] outputs and a pulldown resistor to the RXPRTY output. The resistors should be of such strength
that the non-driven state of the Rx Any-PHY Bus can be detected within 16
RXCLK cycles. If the FREEDM-84A672 outputs a truncated burst of data and
the downstream device is not monitoring RVAL and is expecting a fixed length
burst of data, the downstream device will observe parity errors and can take
appropriate action such as discarding the packet.
uo
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11
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i)
inv
ef
Performance with workaround:
yV
FREEDM-84A672 operates correctly.
Do
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Performance without workaround:
The downstream device may sample invalid packet data.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMER’S INTERNAL USE
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PM7385 FREEDM-84A672
DATASHEET ERRATA
ISSUE 6
FREEDM-84A672 REVISION C DEVICE ERRATA
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PMC-2000954
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Incorrect T1 tributary CAS Phase Information may be generated on SBI
Bus.
11
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2.4.
02
Description:
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When a T1 tributary in the transmit direction is configured as a clock slave
(CLK_MSTR bit in register 0x698 set to 0) and the T1 tributary is operating at a line
rate faster than the FREEDM’s base T1 line rate (i.e. the T1 line rate derived from
REFCLK, which the FREEDM uses when a tributary is operating as a clock master),
there is a risk that this condition can cause the FREEDM’s Insert SBI (INSBI) block to
generate incorrect Channel Associated Signalling Phase Information. This can result
in a downstream transmit framer re-aligning to the incorrect signalling phase and
consequently generating incorrect T1 multiframe signalling.
ay
Workarounds:
ef
uo
fo
liv
ett
io
nT
hu
rsd
The generation of incorrect CAS Phase Information over the SBI bus is caused by the
underunning of a FIFO within the INSBI block which containing signalling information.
The underrun is caused by the faster than nominal T1 tributary rate and excessive
delay in responding to this by increasing the rate at which the FIFO is written to. The
delay in responding can, however, be reduced by altering a FIFO threshold coefficient
located in FREEDM register 0x6A4. This register (Documented in section 3.1 of this
document.) defaults to the value ‘xxxxxxxx00101110’ after reset (i.e. the value 2E
hex, with only the 8 least significant bits valid). The register should be reprogrammed to the value 6E hex after device reset. (Bits other than the 8 least
significant bits can be set to any value.)
yV
inv
Performance with workaround:
db
FREEDM-84A672 operates correctly.
Do
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Performance without workaround:
Transmit T1 tributaries which are configured as clock slaves may experience T1
multiframe signalling errors if the T1 tributary is operating at a faster than nominal line
rate.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMER’S INTERNAL USE
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DATASHEET ERRATA
ISSUE 6
FREEDM-84A672 REVISION C DEVICE ERRATA
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Delay Required After Writes to SBI Master Configuration Registers
11
2.5.
:11
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PMC-2000954
02
Description:
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After a write to register 0x04C SBI ADD BUS Master Configuration a delay is required
before subsequent access to this or any INSBI register is permitted. Likewise, after a
write to register 0x048 SBI DROP BUS Master Configuration a delay is required
before subsequent access to this or any EXSBI register is permitted.
,1
9S
Workarounds:
liv
uo
fo
Performance with workaround:
ett
io
nT
hu
rsd
ay
A delay should be implemented after writing to 0x04C SBI ADD BUS Master
Configuration register before subsequent accesses to this or any INSBI registers.
Likewise, a delay should be implemented after writing to 0x048 SBI DROP BUS
Master Configuration register before subsequent accesses to this or any EXSBI
registers. The wait period, in each case, must be sufficient to ensure that a C1FP
pulse has occurred between the first register write and any subsequent writes.
yV
inv
ef
With the implementation of a wait period sufficient enough to ensure that a CIFP
pulse has occurred between the first register write and any subsequent writes,
F84A672 will work correctly even on fast micro controller accesses.
Do
wn
loa
de
db
Performance without workaround:
Without the implementation of a delay, customers with fast micro controller port
accesses to the FREEDM may observe corrupt packets in one or several SBI SPEs.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMER’S INTERNAL USE
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PM7385 FREEDM-84A672
DATASHEET ERRATA
ISSUE 6
FREEDM-84A672 REVISION C DEVICE ERRATA
PM
PMC-2000954
:11
Reset of SBI Tributaries are Required if C1FP is Sourced Externally (such
as from a TEMUX)
11
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2.6.
02
Description:
9S
ep
tem
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When the C1FP signal is supplied externally by devices such as the TEMUX or
TEMUX-84, the FREEDM84’s SBI Insert block may come up in a state where the
framing information passed across the SBI Bus does not contain correct framing
alignment. There is no means to detect this problem in the FREEDM or the attached
TEMUX/TEMUX-84. This problem would be detected at the far end framer where
occasion loss of frame would be detected.
ay
,1
Workarounds:
uo
fo
Performance with workaround:
liv
ett
io
nT
hu
rsd
All SBI tributaries in use must be reset when first initialized. This requires the
tributaries to be enabled, disabled, and then re-enabled after the C1FP pulse is
sourced. When using the SBI Bus in asynchronous mode at least 500us should be
allowed to pass after disabling a tributary to ensure the C1FP signal has been
sourced at least once, prior to re-enabling the tributary.
yV
inv
ef
The framing alignment passed on the SBI bus will be correct and frame loss should
not occur. As a result the FREEDM84 will operate correctly.
db
Performance without workaround:
Do
wn
loa
de
The framing information passed on the SBI bus may not contain correct framing
alignment. As a result, frame loss may be detected at the far end framer.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMER’S INTERNAL USE
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PM7385 FREEDM-84A672
DATASHEET ERRATA
ISSUE 6
FREEDM-84A672 REVISION C DEVICE ERRATA
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PMC-2000954
:11
Documentation Errors
:24
3.
11
This section lists the known documentation errors in Issue 6 of PMC-1990114
FREEDM-84A672 Datasheet (as of the publication date of this document).
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ay
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02
Please report any documentation errors not covered in this document to PMC-Sierra.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMER’S INTERNAL USE
10
PM7385 FREEDM-84A672
DATASHEET ERRATA
ISSUE 6
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Addition of “SBI INSERT MIN_THR and MAX_THR for T1”.
:24
3.1.
02
11
Description:
r,
20
Register 0x6A4: SBI INSERT MIN_THR and MAX_THR for T1 was omitted from the
Datasheet. The following text describes the register:
Type
Function
Default
Bit 15 to 8
R/W
Reserved
0000H
Bit 7
R/W
MIN_THR_T1[3]
0
Bit 6
R/W
MIN_THR_T1[2]
Bit 5
R/W
MIN_THR_T1[1]
Bit 4
R/W
MIN_THR_T1[0]
0
Bit 3
R/W
MAX_THR_T1[3]
1
Bit 2
R/W
MAX_THR_T1[2]
1
Bit 1
R/W
MAX_THR_T1[1]
1
Bit 0
R/W
MAX_THR_T1[0]
0
0
1
uo
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Bit
ett
tem
be
Register 0x6A4 : SBI INSERT MIN_THR and MAX_THR for T1
ef
MIN_THR_T1[3:0]:
db
yV
inv
The Minimum Threshold for T1 bits (MIN_THR_T1[3:0]) specify the FIFO depth
below which a positive justification on the SBI ADD bus is performed, in clock
master mode, or a speed up request is made from the INSBI to the SIPO block in
clock slave mode.
Do
wn
loa
de
Note - The value of this field defaults to 2 hex after device reset, but should
be set to 6 hex for correct operation with T1 tributaries. (Refer to Section 2.4
of this document for additional information.)
MAX_THR_T1[3:0]:
The Maximum Threshold for T1 bits (MAX_THR_T1[3:0]) specify the FIFO depth
which when exceeded will cause a negative justification on the SBI ADD bus to be
performed, in clock master mode, or a slow down request from the INSBI to the
SIPO block to be made in clock slave mode. The actual Maximum threshold used
is the programmed value plus sixteen.
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PM7385 FREEDM-84A672
DATASHEET ERRATA
ISSUE 6
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Figure 32 in Datasheet has Signals Labeled Incorrectly
:24
3.2.
11
Description:
Do
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db
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inv
ef
uo
fo
liv
ett
io
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rsd
ay
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ep
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02
Figure 32 – Microprocessor Write Access Timing in the datasheet contains signals
labeled A[7:0] and D[7:0]. These should be changed to A[11:2] and D[15:0] respectively.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMER’S INTERNAL USE
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DATASHEET ERRATA
ISSUE 6
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:11
PROV and DELIN bits in Register 0x204 are Write-Only
:24
3.3.
02
11
PROV and DELIN bits in Register 0x204 are write-only and not read/write. Changes
to the register table are shown below.
Default
Bit 15
R/W W
PROV
0
Bit 14
R/W
STRIP
0
Bit 13
R/W W
DELIN
0
Bit 12
R
TAVAIL
Bit 11
W
Reserved
Bit 10
W
FPTR[10]
Bit 9
W
FPTR[9]
Bit 8
W
FPTR[8]
X
Bit 7
W
FPTR[7]
io
X
Bit 6
W
FPTR[6]
ett
X
Bit 5
W
FPTR[5]
X
Bit 4
W
FPTR[4]
X
Bit 3
W
FPTR[3]
X
Bit 2
W
FPTR[2]
X
Bit 1
W
yV
FPTR[1]
X
Bit 0
W
FPTR[0]
X
ep
9S
ay
rsd
hu
nT
liv
fo
uo
ef
,1
X
X
X
X
Do
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inv
20
Function
r,
Type
tem
be
Bit
db
Register 0x204 : RHDL Indirect Channel Data Register #1
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:11
7BIT, INVERT, CRC[1], and CRC[0] bits in Register 0x208 are Write-Only
:24
3.4.
02
11
7BIT, INVERT, CRC[1], and CRC[0] bits in Register 0x208 are write-only and not
read/write. Changes to the register table are shown below.
Function
Default
Bit 15
R/W W
7BIT
0
Bit 14
R/W
PRIORITY
0
Bit 13
R/W W
INVERT
0
CRC[1]
Bit 10
R/W W
CRC[0]
Bit 9
R/W
OFFSET[1]
Bit 8
R/W
OFFSET[0]
hu
0
0
Unused
X
Bit 6
Unused
X
Unused
X
Unused
X
XFER[3]
0
XFER[2]
0
XFER[1]
0
XFER[0]
0
liv
io
0
ett
nT
0
Bit 7
fo
Bit 2
R/W
Bit 1
R/W
yV
db
R/W
Do
wn
loa
de
Bit 0
ef
R/W
inv
Bit 3
uo
Bit 4
ep
9S
R/W W
ay
Bit 11
Bit 5
3.5.
X
,1
Unused
rsd
Bit 12
r,
Type
tem
be
Bit
20
Register 0x208 : RHDL Indirect Channel Data Register #2
Addition of “SBI INSERT MIN_THR and MAX_THR for E1”.
Description:
Register 0x6A8: SBI INSERT MIN_THR and MAX_THR for E1 was omitted from the
Datasheet. The following text describes the register:
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DATASHEET ERRATA
ISSUE 6
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:11
Register 0x6A8: MIN_THR and MAX_THR for E1 Register
Type
Function
Default
Bit 7
R/W
MIN_THR_E1[3]
Bit 6
R/W
MIN_THR_E1[2]
Bit 5
R/W
MIN_THR_E1[1]
Bit 4
R/W
MIN_THR_E1[0]
Bit 3
R/W
MAX_THR_E1[3]
1
Bit 2
R/W
MAX_THR_E1[2]
1
Bit 1
R/W
MAX_THR_E1[1]
1
Bit 0
R/W
MAX_THR_E1[0]
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Bit
0
0
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MIN_THR_E1[3:0]
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Used to modify the Minimum Threshold for E1 tributaries. The Minimum threshold is
the FIFO depth below which a positive justification is performed, in clock master
mode, or a speed up CKCTL request is generated in clock slave mode.
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MAX_THR_E1[3:0]
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Note: The default value of MIN_THR_E1 should be reprogrammed at powerup to
be 0110.
3.6.
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Used to modify the Maximum Threshold for E1 tributaries. The Maximum threshold is
the FIFO depth which when exceeded will cause a negative justification, in clock
master mode, or a slow down CKCTL request in clock slave mode. The actual
Maximum threshold used is the programmed value plus sixteen.
New Patents Issued
Description:
The technology discussed is protected by one or more of the following Patents and
the Patents listed in the data sheet document:
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMER’S INTERNAL USE
15
PM7385 FREEDM-84A672
DATASHEET ERRATA
ISSUE 6
FREEDM-84A672 REVISION C DEVICE ERRATA
PM
PMC-2000954
:11
U.S. Patent No. 6,333,935
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:24
Relevant patent applications and other patents may also exist.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC. AND FOR ITS CUSTOMER’S INTERNAL USE
16
PM7385 FREEDM-84A672
DATASHEET ERRATA
ISSUE 6
FREEDM-84A672 REVISION C DEVICE ERRATA
PM
PMC-2000954
:11
Contacting PMC-Sierra
:24
4.
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02
11
PMC-Sierra, Inc.
105 - 8555 Baxter Place
Burnaby, BC V5A 4V7
Tel: (604) 415-6000
Fax: (604) 415-6200
[email protected]
[email protected]
http://www.pmc-sierra.com
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Product information:
Applications information:
Internet:
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Seller will have no obligation or liability in respect of defects or damage caused by unauthorized use, mis-use,
accident, external cause, installation error, or normal wear and tear. There are no warranties, representations or
guarantees of any kind, either express or implied by law or custom, regarding the product or its performance,
including those regarding quality, merchantability, fitness for purpose, condition, design, title, infringement of thirdparty rights, or conformance with sample. Seller shall not be responsible for any loss or damage of whatever nature
resulting from the use of, or reliance upon, the information contained in this document. In no event will Seller be
liable to Buyer or to any other party for loss of profits, loss of savings, or punitive, exemplary, incidental,
consequential or special damages, even if Seller has knowledge of the possibility of such potential loss or damage
and even if caused by Seller’s negligence.
© 2002 PMC-Sierra, Inc.
Issue date: April, 2002
PMC-Sierra, Inc.
105 - 8555 Baxter Place Burnaby, BC Canada V5A 4V7 604 415 6000