EA218E Datasheet, PDF (9/28 Pages) Zarlink Semiconductor Inc – EA218E 8-Port Ethernet Access Controller XpressFlow 2020 Ethernet Routing Switch Chipset

PRELIMINARY
XpressFlow-2020 Series –
Ethernet Switch Chipset
INFORMATION
EA218E
8-Port 10Mb Ethernet Access Controller
2. FUNCTIONAL DESCRIPTION
2.1 Local Memory (Local Buffer Memory) Interface
Uses industry standard Synchronous Burst Mode SRAM up to 1M bytes
9 32k x 32, 64k x 32, 128k x 32, or 256k x 32
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
2.1.1 Pin Description
Symbol
L_D[31:0]
L_A[18:2]
L_A[19] /
L_OE[3]#
L_OE[2:0]#
L_WE[3:0]#
L_BWE[3:0]#
L_ADSC#
L_CLK
L_D[31:0]
L_A[18:2]
L_A[19] /
L_WE[3]#
L_WE[2:0]#
L_OE[3:0]#
L_BWE[3:0]#
L_ADSC#
L_CLK
Type
Name and Functions
TTL I/O-TS Local Memory Data Bus Bit [31:0] – a 32-bit synchronous data bus.
CMOS Output
CMOS Output
CMOS Output
CMOS Output
CMOS Output
CMOS Output
CMOS Output
TTL I/O-TS
CMOS Output
CMOS Output
CMOS Output
CMOS Output
CMOS Output
CMOS Output
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.
Local Memory Address Bus Bit [19] or Local Memory Read Chip Select [3] – De-
pends on memory configuration, this pin can be used as the Local Memory Address Bit
[19] or as the Local Memory Read Chip Select [3].
Local Memory Read Chip Select [2:0] – allows up to read one of the 4 banks of mem-
ory.
Local Memory Write Chip Select [3:0] – allows up to write one of the 4 banks of mem-
ory.
Local Memory Byte Write Enable [3:0] – use to write individual bytes.
Local Memory Controller Address Status – to load a new address.
Local Memory Clock – a synchronous clock to memory devices.
Local Memory Data Bus Bit [31:0] – a 32-bit synchronous data bus.
Local Memory Address Bus Bit [18:2] – Bit [17:2] of a synchronous address bus. The
memory address is sampled when L_CS# is enabled and L_ADSC# is asserted.
Local Memory Address Bus Bit [19] or Local Memory Write Chip Select [3] – De-
pends on memory configuration, this pin can be used as the Local Memory Address Bit
[19] or as the Local Memory Write Chip Select [3].
Local Memory Write Chip Select [2:0] – allows up to write one of the 4 banks of mem-
ory.
Local Memory Read Chip Select [3:0] – allows up to read one of the 4 banks of mem-
ory.
Local Memory Byte Write Enable [3:0] – use to write individual bytes.
Local Memory Controller Address Status – to load a new address.
Local Memory Clock – a synchronous clock to memory devices.
Note:
These pins have weak internal pull up resistors (50k to 100k Ohms each).
© 1998 Zarlink Semiconductor, Inc.
8
Rev.2.1 – February, 1999