參數(shù)資料
型號: IDT82V2616BBG
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 24/99頁
文件大?。?/td> 0K
描述: IC INVERSE MUX 16CH ATM 272-PBGA
標(biāo)準(zhǔn)包裝: 1
應(yīng)用: 無線
接口: Utopia
電源電壓: 2.97 V ~ 3.63 V
封裝/外殼: 260-BGA
供應(yīng)商設(shè)備封裝: 260-PBGA(19x19)
包裝: 托盤
安裝類型: 表面貼裝
其它名稱: 82V2616BBG
INTERFACE
30
December 4, 2006
IDT82V2616
Inverse Multiplexing for ATM
3.4
SRAM INTERFACE
The SRAM interface has an 8-bit wide data bus, EMD[7:0], and a 20-
bit wide address bus, EMA[19:0]. The minimum throughput is 8 Mbyte/s
and the minimum access 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 from the external SRAM.
The size of the SRAM can be selected from 4K byte to 1024 Kbyte.
When the minimum 4K byte memory is selected, only 12 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 SRAM Size in T1 Unchannelized Mode
SRAM Used
(Kbyte)
Maximum Delay Tolerance
(ms)
Address Bus Used
1024
281
EMA[19:0]
512
141
EMA[18:0]
256
70
EMA[17:0]
128
35
EMA[16:0]
64
17.58
EMA[15:0]
32
8.79
EMA[14:0]
16
4.39
EMA[13:0]
8
2.20
EMA[12:0]
4
1.10
EMA[11:0]
Table-15 Maximum Delay Tolerance Value for Different SRAM Size in E1 Unchannelized Mode
SRAM Used
(Kbyte)
Maximum Delay Tolerance
(ms)
Address Bus Used
1024
212
EMA[19:0]
512
106
EMA[18:0]
256
53
EMA[17:0]
128
26.5
EMA[16:0]
64
13.25
EMA[15:0]
32
6.625
EMA[14:0]
16
3.31
EMA[13:0]
8
1.66
EMA[12:0]
4
0.83
EMA[11:0]
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