[参考译文] PCI1520：P2C 接口无活动--电源开关未启用电源

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Other Parts Discussed in Thread: TPS2223A, PCI1520, PCI2050B

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1517782/pci1520-no-activity-on-p2c-interface----power-switch-not-enabling-power

部件号：PCI1520
主题中讨论的其他部件：TPS2223A、、 PCI2050B

工具/软件：

我们将在搭配 PCI1520的设计中使用 TPS2223A。 TPS2223A 的原理图摘录如下。 LATCH 信号上有一个2k 下拉电阻、时钟信号上有一个43k 下拉电阻。

我们看到的问题是：

在上电和初始化期间、在任何时候都不会出现 P2C 总线活动(时钟、数据或锁存器)。
无论是否插入卡、套接字控制寄存器更新等、TPS2223A 的插槽 A VCC 或 VPP 始终没有输出、插槽 B VCC 为5.0V、插槽 B VPP 也没有输出
插入3.3V 卡后、我们可以看到 SW 驱动器将套接字控制寄存器设置为0x433、但没有 VCC 输出
我们尝试手动将套接字控制寄存器设置为0x400、0x433和0x422、VCC 输出状态没有变化

在插槽 A 中安装了3.3V PCMCIA 内存卡且插槽 B 中未安装卡的设备的 PCI 配置空间如下所示：

02：00.0 CardBus 桥接器：德州仪器(TI) PCI1520 PC 卡 CardBus 控制器(版本01)
00：4C 10 55 AC 07 00 10 02 01 00 07 06 10 A8 82 00
10：00 00 00 e0 a0 00 02 02 03 06 b0 00 10 00 e0
20：00 10 00 e0 00 20 00 e0 00 20 00 e0 00 00 00 00 00
30：00 00 00 00 00 00 00 00 00 00 00 00 00 00 20 01 c0 05
40：78 56 34 12 01 00 00 00 00 00 00 00 00 00 00 00 00
50：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
60：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80：60 f0 44 28 00 00 00 00 00 00 00 00 02 0d 00 d0 00
90：C0 00 64 60 00 00 00 00 00 00 00 00 00 00 00 00 00 00
A0：01 00 02 7e 00 00 c0 00 1f 08 00 00 0b 00 00 00 00
b0：00 00 00 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00
C0：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
E0：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
F0：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

02：00.1 CardBus 桥接器：德州仪器(TI) PCI1520 PC 卡 CardBus 控制器(版本01)
00：4C 10 55 AC 07 00 10 02 01 00 07 06 10 A8 82 00
10：00 30 00 e0 a0 00 00 02 07 0A b0 00 40 00 e0
20：00 40 00 e0 00 50 00 e0 00 50 00 e0 00 00 00 00 00
30：00 00 00 00 00 00 00 00 00 00 00 00 00 00 20 01 c0 05
40：78 56 34 12 01 00 00 00 00 00 00 00 00 00 00 00 00
50：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
60：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80：60 d0 44 28 00 00 00 00 00 00 00 00 02 0d 00 d0 00
90：C0 00 64 60 00 00 00 00 00 00 00 00 00 00 00 00 00 00
A0：01 00 02 7e 00 00 c0 00 1f 08 00 00 0b 00 00 00 00
b0：00 00 00 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00
C0：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
E0：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
F0：00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

插槽 A 中安装了3.3V PCMCIA 存储卡且插槽 B 中未安装卡的两个插槽的 CardBus 插槽寄存器如下所示。这些寄存器内容是在 Linux 引导且 yenta 驱动程序已尝试初始化桥接器之后进行的。

root@dsdts-linux：~# devmem 0xE0000000 32
0x00000000
root@dsdts-linux：~# devmem 0xE0000004 32
0x00000006
root@dsdts-linux：~# devmem 0xE0000008 32
0x30000818
root@dsdts-linux：~# devmem 0xE000000C 32
0x00000000
root@dsdts-linux：~# devmem 0xE0000010 32
0x00000433
root@dsdts-linux：~# devmem 0xE0000020 32
0x00000000
root@dsdts-linux：~# devmem 0xE0003000 32
0x00000000
root@dsdts-linux：~# devmem 0xE0003004 32
0x00000006
root@dsdts-linux：~# devmem 0xE0003008 32
0x300000C6
root@dsdts-linux：~# devmem 0xE000300C 32
0x00000000
root@dsdts-linux：~# devmem 0xE0003010 32
0x00000400
root@dsdts-linux：~# devmem 0xE0003020 32
0x00000000