參數(shù)資料
型號(hào)： 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(yè)數(shù)： 29/29頁(yè)
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: 8
Rev. 4.0 –December, 1997
4. FUNCTIONAL DESCRIPTION
4.1 Local Memory (Local Buffer Memory) Interface
Use industry standard Synchronous Burst Mode SRAM up to 1M bytes
32k x 32, 64k x 32, 128k x 32, or 256k x 32
Provides 4 individual Byte Write Enable controls ( L_BWE[3:0]# )
Provides separate Read and Write Chip Selects ( L_OE[3:0]# and L_WE[3:0]# ) for each memory chip
Supports back to back Read or Write operations across memory chips
4.1.1 Pin Description
Symbol
Type
Name & Functions
L_D[31:0]
@
TTL
I/O-TS
Local Memory Data Bus Bit [31:0] – a 32-bit synchronous data bus.
L_A[18:2]
CMOS
Output
Local Memory Address Bus Bit [18:2] – Bit [18:2] of a synchronous
address bus. The memory address is sampled when L_CS# is enabled
and L_ADSC# is asserted.
L_A[19] /
L_OE[3]#
CMOS
Output
Local Memory Address Bus Bit [19] or Local Memory Read Chip
Select [3] – Depends on memory configuration, this pin can be used as
the Local Memory Address Bit [19] or as the Local Memory Read Chip
Select [3].
L_OE[2:0]#
CMOS
Output
Local Memory Read Chip Select [2:0] – allows up to read one of the 4
banks of memory.
L_WE[3:0]#
CMOS
Output
Local Memory Write Chip Select [3:0] – allows up to write one of the 4
banks of memory.
L_BWE[3:0]#
CMOS
Output
Local Memory Byte Write Enable [3:0] – use to write individual bytes.
L_ADSC#
CMOS
Output
Local Memory Controller Address Status – to load a new address.
L_CLK
CMOS
Output
Local Memory Clock – a synchronous clock to memory devices.
Note:
@ These pins have weak internal pull up resistors (50k to 100k Ohms each).
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