參數(shù)資料
型號: MEA224AG
廠商: CONEXANT SYSTEMS
元件分類: 微控制器/微處理器
英文描述: 4 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PBGA352
封裝: 35 X 35 MM, 2.33 MM HEIGHT, PLASTIC, MS-034, BGA-352
文件頁數(shù): 2/29頁
文件大小: 519K
代理商: MEA224AG
PRELI
MI
NARY
D
A
TA
S
H
EET
XpressFlow-2001 Series –
EA-224
Ethernet Switch Chip-set
4-Port 10/100M Ethernet Access Controller
1997 Zarlink Semiconductor Inc.
Page: 9
Rev. 4.0 –December, 1997
4.1.2 Supported Memory Configurations
Read/Write Chip Select and High Address Bits
Chip #3
Chip #2
Chip #1
Chip #0
RAM Chip
Size
# of RAM
Chips
Total Buffer
Memory Size
L_WE[3]#
L_A[19] /
L_OE[3]#
L_WE[2]# L_OE[2]# L_WE[1]# L_OE[1]# L_WE[0]# L_OE[0]#
32k x 32
1
128k bytes
----
L_WE[0]#
L_OE[0]#
2
256k bytes
----
L_WE[1]#
L_OE[1]#
L_WE[0]#
L_OE[0]#
4
512k bytes
L_WE[3]#
L_OE[3]#
L_WE[2]#
L_OE[2]#
L_WE[1]#
L_OE[1]#
L_WE[0]#
L_OE[0]#
64k x 32
1
256k bytes
----
L_WE[0]#
L_OE[0]#
2
512k bytes
----
L_WE[1]#
L_OE[1]#
L_WE[0]#
L_OE[0]#
4
1M bytes
L_WE[3]#
L_OE[3]#
L_WE[2]#
L_OE[2]#
L_WE[1]#
L_OE[1]#
L_WE[0]#
L_OE[0]#
128k x32
1
512k bytes
----
L_WE[0]#
L_OE[0]#
2
1M bytes
----
L_WE[1]#
L_OE[1]#
L_WE[0]#
L_OE[0]#
256k x32
1
1M bytes
----
L_A[19]
----
L_WE[0]#
L_OE[0]#
4.1.3 Bus Cycle Waveforms
A1
A2
A3
A3+1
A3+2
A3+3
A4
A4+1
A4+2
A4+3
A5
A6
D2
D3+1
D3+2
D3+3
D4
D4+1
D4+2
D4+3
D5
D6
D1
D3
L_CLK
L_ADSC#
L_CS#
L_A[19:2]
L_WE[3:0]#
L_BWE[3:0]#
L_OE[3:0]#
L_D[31:0] (Wr)
L_D[31:0] (Rd)
Typical Local Memory Access Operations
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