mt90528ag2 Zarlink Semiconductor, mt90528ag2 Datasheet - Page 39
mt90528ag2
Manufacturer Part Number
mt90528ag2
Description
28-port Primary Rate Circuit Emulation Aal1 Sar
Manufacturer
Zarlink Semiconductor
Datasheet
1.MT90528AG2.pdf
(195 pages)
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address is sampled by the memory. A flow-through write cycle requires that valid data be placed on the data bus
before the next rising clock edge after the address is sampled. On the other hand, data must be valid before the
second rising edge of the clock after the address is presented to memory in the case of pipelined RAM.
Accesses to/from the external memory are made on a word-wide (i.e., 16-bit) basis. 2 optional bits,
MEM_DATA[17:16], can provide parity data regarding the external memory data. The external memory interface
module of the MT90528 generates MEM_DATA[17] to represent the even parity bit over MEM_DATA[15:8].
Similarly, MEM_DATA[16] represents the even parity bit over MEM_DATA[7:0]. When data is read from external
CLOCK
ADDRESS
DATA
CLOCK
ADDRESS
DATA
Note: The number of clock cycles between an address (ADDRESS1) and its read data (DATA1) is
set according to the MTYP field in the Memory Arbiter Configuration Register at byte address
7000h.
Note: The number of clock cycles between an address (ADDRESS1) and its written data
(DATA1) is set according to the MTYP field in the Memory Arbiter Configuration Register at byte
address 7000h.
ADDRESS1
ADDRESS1
Figure 8 - Memory Read Pipeline Length
Figure 9 - Memory Write Pipeline Length
Zarlink Semiconductor Inc.
MT90528
ADDRESS2
ADDRESS2
39
DATA1
DATA1
DATA1
DATA1
Data Sheet
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