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參數資料
| 型號： | UCB1500 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 總線控制器 |
| 英文描述： | PCI to AC97 bridge/host controller |
| 中文描述： | PCI BUS CONTROLLER, PQFP80 |
| 封裝： | 12 X 12 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-315-1, LQFP-80 |
| 文件頁數： | 41/58頁 |
| 文件大小： | 1001K |
| 代理商： | UCB1500 |
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Philips Semiconductors
UCB1500
PCI to AC97 bridge/host controller
Objective specification
Rev. 01 — 4 February 2000
41 of 58
9397 750 06854
Philips Electronics N.V. 2000. All rights reserved.
8.6.22
[da]: Power-on flag (V
aux
powered and sticky) / AC97 reset
8.6.23
[db]: Scratch Register (V
aux
powered)
Table 63: Power-on flag (V
aux
powered and sticky) / AC97 reset register bit description
Bit
Description
8
AC97 Reset
This bit controls the state of the AC97_RST pin (V
aux
powered). At power-up, or
when RST is asserted, AC97_RST pin will be asserted. AC97_RST pin can also
be asserted by writing a “0” to this register bit, and de-asserted by writing a “1”.
Remark:
AC97_RST can only be de-asserted by software, and never by
hardware.
7-0
Power-on flag
Not affected by PCI reset. Used as a signature to control access to power
management registers. Valid values for flag are:
A5h: For Function 0 or 1, all write accesses to PME Status and PME_EN
registers of its PCI configuration space are allowed.
5Ah: (For testing only.) For Function 0 or 1, all write accesses to the
PME Status and PME_EN registers of its PCI configuration space shall be
ignored if either Function 0 or Function 1 is in D3 state.
If power-on flag is neither of these values, all PME Status and PME_EN registers
of Function 0 or 1 are invalid, and PME is not generated externally.
Table 64: Scratch register bit description
V
aux
powered
Bit
Description
15-0
Scratch register
Sticky, can be used for user-defined functions.
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