參數(shù)資料
型號(hào): IDT82V2608BB
廠商: INTEGRATED DEVICE TECHNOLOGY INC
元件分類(lèi): 數(shù)字傳輸電路
英文描述: INVERSE MULTIPLEXING FOR ATM
中文描述: ATM/SONET/SDH SUPPORT CIRCUIT, PBGA208
封裝: PLASTIC, BGA-208
文件頁(yè)數(shù): 29/98頁(yè)
文件大小: 398K
代理商: IDT82V2608BB
INTERFACE
29
December 4, 2006
IDT82V2608
Inverse Multiplexing for ATM
3.4
SRAMINTERFACE
The SRAMinterface has an 8-bit wide data bus, EMD[7:0], and a 19-
bit wide address bus, EMA[18:0]. The mnimumthroughput is 4 Mbyte/s
and the mnimumaccess time is 40ns.
When both
EM_WE
pin and
EM_CS
pin are low, data can be written to the
external SRAM When both
EM_OE
pin and
EM_CS
pin are low, data can be
read fromthe external SRAM
The size of the SRAMcan be selected from2K byte to 512 Kbyte.
When the mnimum2K byte memory is selected, only 11 address pins
will be used. Different memory size will affect different delay compensa-
tion capability.
Table-14
and
Table-15
show memory size vs. maximum
delay tolerance in T1 and E1 unchannelized modes respectively.
Table-14 Maximum Delay Tolerance Value for Different SRAMSize in T1 Unchannelized Mode
SRAMUsed
(Kbyte)
Maximum Delay Tolerance
(ms)
Address Bus Used
512
281
EMA[18:0]
256
141
EMA[17:0]
128
70
EMA[16:0]
64
35
EMA[15:0]
32
17.58
EMA[14:0]
16
8.79
EMA[13:0]
8
4.39
EMA[12:0]
4
2.20
EMA[11:0]
2
1.10
EMA[10:0]
Table-15 Maximum Delay Tolerance Value for Different SRAMSize in E1 Unchannelized Mode
SRAMUsed
(Kbyte)
Maximum Delay Tolerance
(ms)
Address Bus Used
512
212
EMA[18:0]
256
106
EMA[17:0]
128
53
EMA[16:0]
64
26.5
EMA[15:0]
32
13.25
EMA[14:0]
16
6.625
EMA[13:0]
8
3.31
EMA[12:0]
4
1.66
EMA[11:0]
2
0.83
EMA[10:0]
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