OX12PCI840 Datasheet, PDF (23/33 Pages) List of Unclassifed Manufacturers – Integrated Parallel Port and PCI interface

OXFORD SEMICONDUCTOR LTD.
6.2.2 Zone1: Local Configuration Registers
The Zone1 region of EEPROM contains the program value
of the vendor-specific Local Configuration Registers using
one or more configuration WORDs. Registers are selected
using a 7-bit byte-offset field. This offset value is the offset
from Base Address Registers in I/O or memory space (see
section 4.4).
Note: Not all of the registers in the Local Configuration Register set are
writable by EEPROM. If bit3 of the header is set, Zone1
configuration WORDs follow the header declaration. The
format of configuration WORDs for the Local Configuration
Registers in Zone1 are described in Table 8.
OX12PCI840
Bits Description
15 ‘0’ = There are no more Configuration WORDs
to follow in Zone1. Move to the next available
zone or end EEPROM program if no more zones
are enabled in the Header.
‘1’ = There is another Configuration WORD to
follow for the Local Configuration Registers.
14:8 These seven bits define the byte-offset of the
Local configuration register to be programmed.
For example the byte-offset for LT2[23:16] is
0x0E.
7:0 8-bit value of the register to be programmed
Table 8: Zone 1 data format
6.2.3 Zone2: Identification Registers
The Zone2 region of EEPROM contains the program value
for Vendor ID and Subsystem Vendor ID. The format of
Device Identification configuration WORDs are described in
Table 9.
Bits Description
15 ‘0’ = There are no more Zone2 (Identification)
bytes to program. Move to the next available
zone or end EEPROM program if no more zones
are enabled in the Header.
‘1’ = There is another Zone2 (Identification) byte
to follow.
14:8 0x00 = Vendor ID bits [7:0].
0x01 = Vendor ID bits [15:8].
0x02 = Subsystem Vendor ID [7:0].
0x03 = Subsystem Vendor ID [15:8].
0x03 to 0x7F = Reserved.
7:0 8-bit value of the register to be programmed
Table 9: Zone 2 data format
6.2.4 Zone3: PCI Configuration Registers
The Zone3 region of EEPROM contains any changes
required to the PCI Configuration registers (with the
exception of Vendor ID and Subsystem Vendor ID which
are programmed in Zone2). This zone consists of a
function header WORD, and one or more configuration
WORDs for that function. The function header is described
in Table 10.
Bits Description
15 ‘0’ = End of Zone 3.
‘1’ = Define this function header.
14:3 Reserved. Write zeros.
2:0 Function number for the following configuration
WORD(s).
‘000’ = Function0
Other values = Reserved.
Table 10: Zone 3 data format (Function Header)
The subsequent WORDs for each function contain the
address offset and a byte of programming data for the PCI
Configuration Space belonging to the function number
selected by the proceeding Function-Header. The format of
configuration WORDs for the PCI Configuration Registers
are described below.
DS-0021 Jun 05
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