82595TX Datasheet, PDF (22/59 Pages) Intel Corporation – ISA/PCMCIA HIGH INTEGRATION ETHERNET CONTROLLER

82595TX
4 6 Boot EPROM FLASH Interface
The Boot EPROM FLASH of an 82595TX solution is
read from or written to (FLASH only) whenever the
host CPU performs a Read or a Write operation to a
memory location that is within the Boot EPROM
FLASH mapping window This window is program-
mable throughout the ISA PROM address range
(C8000–DFFFF) by configuring the 82595TX Boot
EPROM Decode Window register (Bank 1 Register
2 bits 4–6) The 82595TX asserts the BOOTCS
signal when it decodes a valid access Up to 1
MBytes of FLASH can be addressed by the
82595TX
with the decode of A0 – A9 and assertion of either a
OE or WE The 82595TX Card Configuration Regis-
ters are shown at the bottom of this page
4 9 PCMCIA Decode Functions
The Attribute Memory and Common Memory map
for a PCMCIA card is shown below Attribute Memo-
ry is defined as the CIS structures (residing in
FLASH below 1K) and the CCR Registers (residing
in the 82595TX) Common Memory is defined as the
FLASH memory above 1K
128 Kbyte FLASH
4 7 IA PROM Interface
7
0
The 82595TX supports an IA PROM interface Im-
plementation of an IA PROM in a 82595TX solution
is optional The IA can also be stored in the serial
EEPROM In this case the IA PROM is not needed
For Plug N’ Play an IA PROM cannot be used
FLASH
COMMON
MEMORY
131 071
4 8 PCMCIA CIS Structures
The 82595TX supports access to 1K of Attribute
Memory when configured for PCMCIA support Attri-
bute memory is defined by the PCMCIA standard to
be comprised of the Card Information Structure
(FLASH memory referred to as CIS residing at mem-
ory offset 0 to 1015 decimal) and 4 8-bit Card Con-
figuration Registers which reside at memory offset
1016 to 1022 on even boundaries only (1016 1018
1020 1022) These four registers are contained in
the 82595TX They are memory mapped and are ac-
cessed when CE1 and REG are asserted low along
1025
1024
CCR 3
CCR 2
CCR 1
CCR 0
(82595TX)
(82595TX)
(82595TX)
(82595TX)
1022 _{Access to}
1020 82595TX
*¹⁰¹⁸
1016
for these
locations
1015
FLASH
CIS
REGISTERS
01
00
7
6
RESET
0
0
0
0
0
0
0
5
0
IOIS8
0
0
82595TX Card Configuration Registers
4
3
2
1
0
0
0
XIP En
EvntWk
0
0
IREQ
0
0
0
0
0
0
0
0
0
IO En
0
0
0
CCR 0 (Addr 1016)
CCR 1 (Addr 1018)
CCR 2 (Addr 1020)
CCR 3 (Addr 1022)
NOTE
All 0’s in the above registers are reserved
22