UCB1500 Просмотр технического описания (PDF) - Philips Electronics
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UCB1500 Datasheet PDF : 58 Pages
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Philips Semiconductors
UCB1500
PCI to AC97 bridge/host controller
7. PCI configuration space
7.1 Overview
By default, UCB1500 supports a single modem function. Under control of BIOS or an
external serial EEPROM, UCB1500 can support a maximum of two PCI functions,
which are typically one modem plus one audio functions. To allow IHV to overwrite
parameters such as Device ID, Vendor ID, Subsystem Vendor ID, Subsystem ID,
Class Code and Power Management Capabilities, UCB1500 provides two schemes:
• For each function, Device ID, Vendor ID, Subsystem Vendor ID, Subsystem ID,
Class Code and Power Management Capabilities are placed in a dedicated PCI
configuration read/write area accessible by the corresponding function. An enable
bit for Function 1 is placed in a dedicated read/write area accessible by Function 0.
This allows IHVs to enable Function 1 and change the corresponding read-only
parameters of Functions 0 and 1 (if enabled) in the BIOS POST routine when
UCB1500 is used as a motherboard device.
• In case UCB1500 is used as a PCI card which BIOS cannot control, the above
parameters, together with Function 1 enable, can be changed by the external
serial EEPROM.
The EEPROM data map is given in Table 3.
Table 3: EEPROM data map
Byte address Tag
00-01h
signature
02-03h
control
04-05h
06-07h
08-09h
0A-0Bh
0C-0Dh
0Eh
0F-11h
12-13h
14-15h
16-17h
18-19h
1A-1Bh
1Ch
1D-1Fh
sub_vendorID
subsystemID
pmc
vendorID
deviceID
--
classCode
sub_vendorID
subsystemID
pmc
vendorID
deviceID
--
classCode
Description
1516h = valid signature, otherwise disable autoloading.
Bit 0: 1=enable function 1, 0=disable function 1
Bit 1: 1=enable function 0 auto-loading from address 04-9Dh
Bit 2: 1=enable function 0 auto-loading from address 0A-11h
Bit 3: 1=enable function 1 auto-loading from address 10-17h
Bit 4: 1=enable function 1 auto-loading from address 18-1Fh
Other bits: reserved and must be 0s.
Function 0 subsystem vendor ID, PCI configuration space address 2C-2Dh.
Function 0 subsystem ID, PCI configuration space address 2E-2Fh.
Function 0 power management capabilities, PCI configuration space address 82h.
Function 0 vendor ID, PCI configuration space address 00-01h.
Function 0 device ID, PCI configuration space address 02-03h.
Reserved.
Function 0 Class Code, PCI configuration space address 09-0Bh.
Function 1 subsystem vendor ID, PCI configuration space address 2C-2Dh.
Function 1 subsystem ID, PCI configuration space address 2E-2Fh.
Function 1 power management capabilities, PCI configuration space offset 82h.
Function 1 vendor ID, PCI configuration space address 00-01h.
Function 1 device ID, PCI configuration space address 02-03h.
Reserved.
Function 1 Class Code, PCI configuration space address 09-0Bh.
9397 750 06854
Objective specification
Rev. 01 — 4 February 2000
© Philips Electronics N.V. 2000. All rights reserved.
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