MEA-224 Zarlink Semiconductor, Inc., MEA-224 Datasheet - Page 9

• Manufacturer Part Number: MEA-224
• Description: 4-Port, Layer 2 Fast Ethernet Access Controller
• Manufacturer: Zarlink Semiconductor, Inc.

XpressFlow-2001 Series –
Ethernet Switch Chip-set
4.1.2 Supported Memory Configurations
4.1.3 Bus Cycle Waveforms
©
L_D[31:0] (Wr)
L_D[31:0] (Rd)
L_BWE[3:0]#
1997
L_WE[3:0]#
L_OE[3:0]#
RAM Chip
L_ADSC#
128k x32
256k x32
L_A[19:2]
32k x 32
64k x 32
Size
L_CLK
L_CS#
(57(; (7:25.6
# of RAM
Chips
1
2
4
1
2
4
1
2
1
P R E L I M I N A R Y
A1
D1
Memory Size
Total Buffer
128k bytes
256k bytes
512k bytes
256k bytes
512k bytes
512k bytes
1M bytes
1M bytes
1M bytes
A2
Typical Local Memory Access Operations
L_WE[3]#
L_WE[3]# L_OE[3]# L_WE[2]# L_OE[2]# L_WE[1]# L_OE[1]# L_WE[0]# L_OE[0]#
L_WE[3]# L_OE[3]# L_WE[2]# L_OE[2]# L_WE[1]# L_OE[1]# L_WE[0]# L_OE[0]#
D2
----
----
----
----
----
----
----
Chip #3
A3
D3
4-Port 10/100M Ethernet Access Controller
L_OE[3]#
L_A[19] /
L_A[19]
A3+1
D3+1
Read/Write Chip Select and High Address Bits
----
----
----
----
----
----
A3+2
Page: 9
D3+2
L_WE[2]# L_OE[2]# L_WE[1]# L_OE[1]# L_WE[0]# L_OE[0]#
A3+3
D3+3
----
----
----
----
----
----
----
D A T A
Chip #2
A4
A4+1
----
----
----
----
----
----
----
A4+2
D4
L_WE[1]# L_OE[1]# L_WE[0]# L_OE[0]#
L_WE[1]# L_OE[1]# L_WE[0]# L_OE[0]#
L_WE[1]# L_OE[1]# L_WE[0]# L_OE[0]#
S H E E T
----
A4+3
----
----
----
D4+1
Chip #1
D4+2
Rev. 4.0 –December, 1997
----
----
----
----
D4+3
A5
L_WE[0]# L_OE[0]#
L_WE[0]# L_OE[0]#
L_WE[0]# L_OE[0]#
L_WE[0]# L_OE[0]#
Chip #0
D5
EA-224
A6
D6