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PM73121 Datasheet(PDF) 126 Page - PMC-Sierra, Inc

Part # PM73121
Description  AAL1 Segmentation And Reassembly Processor
PDF  223 Pages
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Manufacturer  PMC [PMC-Sierra, Inc]
Direct Link  http://www.pmc-sierra.com
Logo PMC - PMC-Sierra, Inc

PM73121 Datasheet(HTML) 126 Page - PMC-Sierra, Inc

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PMC-Sierra, Inc.
PM73121 AAL1gator II
PMC-980620
,VVXH
AAL1 SAR Processor
Data Sheet
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To eliminate conflicts for this access sequence, a recovery cycle is inserted between the micropro-
cessor access and any subsequent access. /PROC_ACK is driven until /PROC_CS is deactivated.
/SP_DATA_EN is driven until either /PROC_CS or /PROC_OE are deactivated.
Cycles (1) and (2) are grouped together in Figure 72 for the sake of convenience. These are nor-
mally two separate clock cycles.
NOTE: The timing characteristics (indicated by asterisks in the table following Figure 72)
are based on external component requirements.
Figure 72.
Microprocessor RAM Read Cycle Timing
Symbol
Parameter
Signals
Min
Max
Unit
Taa
(Refer to
NOTE below)
Acknowledge assertion after
/PROC_CS or /PROC_RD;
whichever comes last
/PROC_ACK
5
29
SYS_CLK
periods
Tzen
Time from z state to enable
MEM_DATA, /MEM_OE
1**
ns
Tzen
Tq
Taed
Tded
Tded
Tcea
Taa
Tq
Tqmoe
Tq
Tdh
Tasu
Tq
Tah
Tcaen
Tzsu
Tdsu
Tasu17
PROC RD CYCLE
RECOVERY CYCLE NON-PROC CYCLE
NON_PROC WR CYCLE
1, 2
3
4
5
6
SYS_CLK
PROC_ADD
PROC_DATA
/PROC_CS(i)
/PROC_RD(i)i)
ADDR17(i)
/PROC_ACK(o)
/SP_DATA_EN(o)
/SP_ADD_EN(o)
SP_DATA_DIR(o)
SP_DATA_CLK(o)
MEM_ADDR(i)
MEM_DATA(IO)
/MEM_CS(o)
/MEM_OE(o)
/MEM_WE(o)



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