您的位置：维库电子市场网 > Datasheet > CS5530A

CS5530A Datasheet

  • CS5530A

  • National Semiconductor [Geode CS5530A I/O Companion Multi-F...

  • 3879.27KB

  • NSC

阅览下载 纠错 0

扫码查看芯片数据手册

上传产品规格书

PDF预览

Geode鈩?CS5530A
Functional Description
(Continued)
Table 3-14. Suspend Modulation Related Registers
Bit
Description
Power Management Enable Register 1 (R/W)
Reset Value = 00h
F0 Index 80h
4
Video Speedup:
Any video activity, as decoded from the serial connection (PSERIAL register, bit 0) from the GX-series pro-
cessor disables clock throttling (via SUSP#/SUSPA# handshake) for a configurable duration when the system is power man-
aged using CPU Suspend modulation. 0 = Disable; 1 = Enable.
The duration of the speedup is configured in the Video Speedup Timer Count Register (F0 Index 8Dh). Detection of an
external VGA access (3Bxh, 3Cxh, 3Dxh and A000h-B7FFh) on the PCI bus is also supported. This configuration is non-
standard, but it does allow the power management routines to support an external VGA chip.
3
IRQ Speedup:
Any unmasked IRQ (per I/O Port 021h/0A1h) or SMI disables clock throttling (via SUSP#/SUSPA# hand-
shake) for a configurable duration when the system is power managed using CPU Suspend modulation.
0 = Disable; 1 = Enable.
The duration of the speedup is configured in the IRQ Speedup Timer Count Register (F0 Index 8Ch).
IRQ Speedup Timer Count Register (R/W)
Reset Value = 00h
F0 Index 8Ch
7:0
IRQ Speedup Timer Count:
This register holds the load value for the IRQ speedup timer. It is loaded into the timer when
Suspend Modulation is enabled (F0 Index 96h[0] = 1) and an INTR or an access to I/O Port 061h occurs. When the event
occurs, the Suspend Modulation logic is inhibited, permitting full performance operation of the CPU. Upon expiration, no SMI
is generated; the Suspend Modulation begins again. The IRQ speedup timer鈥檚 timebase is 1 ms.
This speedup mechanism allows instantaneous response to system interrupts for full-speed interrupt processing. A typical
value here would be 2 to 4 ms.
F0 Index 8Dh
7:0
Video Speedup Timer Count Register (R/W)
Reset Value = 00h
Video Speedup Timer Count:
This register holds the load value for the Video speedup timer. It is loaded into the timer
when Suspend Modulation is enabled (F0 Index 96h[0] = 1) and any access to the graphics controller occurs. When a video
access occurs, the Suspend Modulation logic is inhibited, permitting full-performance operation of the CPU. Upon expira-
tion, no SMI is generated; the Suspend Modulation begins again. The video speedup timer鈥檚 timebase is 1 ms.
This speedup mechanism allows instantaneous response to video activity for full speed during video processing calcula-
tions. A typical value here would be 50 to 100 ms.
Index 94h
7:0
Suspend Modulation OFF Count Register (R/W)
Reset Value = 00h
Suspend Signal Deasserted Count:
This 8-bit value represents the number of 32 碌s intervals that the SUSP# pin will be
deasserted to the GX-series processor. This timer, together with the Suspend Modulation ON Count Register (F0 Index
95h), perform the Suspend Modulation function for CPU power management. The ratio of the on-to-off count sets up an
effective (emulated) clock frequency, allowing the power manager to reduce CPU power consumption.
This timer is prematurely reset if an enabled speedup event occurs. The speedup events are IRQ speedups and video
speedups.
Index 95h
7:0
Suspend Modulation ON Count Register (R/W)
Reset Value = 00h
Suspend Signal Asserted Count:
This 8-bit value represents the number of 32 碌s intervals that the SUSP# pin will be
asserted. This timer, together with the Suspend Modulation OFF Count Register (F0 Index 94h), perform the Suspend Mod-
ulation function for CPU power management. The ratio of the on-to-off count sets up an effective (emulated) clock fre-
quency, allowing the power manager to reduce CPU power consumption.
This timer is prematurely reset if an enabled speedup event occurs. The speedup events are IRQ speedups and video
speedups.
Revision 1.1
59
www.national.com

CS5530A相关型号PDF文件下载

您可能感兴趣的PDF文件资料

热门IC型号推荐

©2025 维库电子市场网（www.dzsc.com）　备案号：浙B2-20050339-1 经营许可证：浙B2-20210386版权声明
买家服务热线：0571-85317607 | 买家服务部QQ： QQ:1609526468
卖家服务热线：0571-85317607 | 卖家服务部QQ： QQ:331652727

扫码下载APP，
一键连接广大的电子世界。

在线人工客服

买家服务：
卖家服务：
技术客服：

0571-85317607

网站技术支持

13606545031

客服在线时间周一至周五
9:00-17:30

关注官方微信号，
第一时间获取资讯。

建议反馈
返回顶部

建议反馈

联系人：

联系方式：

按住滑块，拖拽到最右边
>>
感谢您向阿库提出的宝贵意见，您的参与是维库提升服务的动力！意见一经采纳，将有感恩红包奉上哦！

PDF纠错X

投诉电话：0571-85317607 投诉QQ：

如选匿名将无法为您反馈投诉结果，建议实名投诉！