最新免费av在线观看,亚洲综合一区成人在线,中文字幕精品无码一区二区三区,中文人妻av高清一区二区,中文字幕乱偷无码av先锋

LPC47M172_07 Datasheet

  • LPC47M172_07

  • SMSC Corporation [Advanced I/O Controller with Motherboard ...

  • SMSC   SMSC

掃碼查看芯片數(shù)據(jù)手冊

上傳產(chǎn)品規(guī)格書

PDF預覽

Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
SYNC Error Indication
The LPC47M172 reports errors via the LAD[3:0] = 1010 SYNC encoding.
If the host was reading data from the LPC47M172, data will still be transferred in the next two nibbles.
This data may be invalid, but it will be transferred by the LPC47M172. If the host was writing data to the
LPC47M172, the data had already been transferred.
In the case of multiple byte cycles, such as memory and DMA cycles, an error SYNC terminates the cycle.
Therefore, if the host is transferring 4 bytes from a device, if the device returns the error SYNC in the first
byte, the other three bytes will not be transferred.
6.3.10 I/O and DMA START Fields
I/O and DMA cycles use a START field of 0000.
Reset Policy
The following rules govern the reset policy:
When nPCI_RESET goes inactive (high), the clock is assumed to have been running for 100usec prior to
the removal of the reset signal, so that everything is stable. This is the same reset active time after clock
is stable that is used for the PCI bus.
When nPCI_RESET goes active (low):
the host drives the nLFRAME signal high, tristates the LAD[3:0] signals, and ignores the nLDRQ
signal.
the LPC47M172 ignores nLFRAME, tristate the LAD[3:0] pins and drive the nLDRQ signal inactive
(high).
6.3.11 LPC Transfers
Wait State Requirements
I/O Transfers
The LPC47M172 inserts three wait states for an I/O read and two wait states for an I/O write cycle. A
SYNC of 0110 is used for all I/O transfers. The exception to this is for transfers where IOCHRDY would
normally be deasserted in an ISA transfer (i.e., EPP or IrCC transfers) in which case the sync pattern of
0110 is used and a large number of syncs may be inserted (up to 330 which corresponds to a timeout of
10us).
DMA Transfers
The LPC47M172 inserts three wait states for a DMA read and four wait states for a DMA write cycle. A
SYNC of 0101 is used for all DMA transfers.
See the example timing for the LPC cycles in the 鈥淭iming Diagrams鈥?section.
SMSC/Non-SMSC Register Sets (Rev.
01-11-07)
Page 36
SMSC LPC47M172
DATASHEET

LPC47M172_07 PDF文件相關型號

LPC47M172-NW

LPC47M172_07相關型號PDF文件下載

您可能感興趣的PDF文件資料

熱門IC型號推薦

掃碼下載APP，
一鍵連接廣大的電子世界。

在線人工客服

買家服務：
賣家服務：
技術客服：

0571-85317607

網(wǎng)站技術支持

13606545031

客服在線時間周一至周五
9:00-17:30

關注官方微信號，
第一時間獲取資訊。

建議反饋
返回頂部

建議反饋

聯(lián)系人：

聯(lián)系方式：

按住滑塊，拖拽到最右邊
>>
感謝您向阿庫提出的寶貴意見，您的參與是維庫提升服務的動力！意見一經(jīng)采納，將有感恩紅包奉上哦！