參數(shù)資料
型號: LAN9116
廠商: SMSC Corporation
英文描述: Highly Efficient Single-Chip 10/100 Non-PCI Ethernet Controller
中文描述: 高效的單芯片10/100非PCI以太網(wǎng)控制器
文件頁數(shù): 111/126頁
文件大?。?/td> 831K
代理商: LAN9116
Highly Efficient Single-Chip 10/100 Non-PCI Ethernet Controller
Datasheet
SMSC LAN9116
111
Revision 1.1 (05-17-05)
DATASHEET
6.1.2
Special Restrictions on Back-to-Back Read Cycles
There are also restrictions on specific back-to-back read operations. These restrictions concern
reading specific registers after reading resources that have side effects. In many cases there is a delay
between reading the LAN9116, and the subsequent indication of the expected change in the control
register values.
In order to prevent the host from reading stale data on back-to-back reads, minimum wait periods have
been established. These periods are specified in
Table 6.2, "Read After Read Timing Rules"
. The host
Table 6.1 Read After Write Timing Rules
REGISTER NAME
MINIMUM WAIT TIME FOR READ
FOLLOWING ANY WRITE CYCLE
(IN NS)
NUMBER OF BYTE_TEST
READS (ASSUMING T
CYCLE
OF
165NS)
ID_REV
0
0
IRQ_CFG
495
3
INT_STS
330
2
INT_EN
165
1
BYTE_TEST
0
0
FIFO_INT
165
1
RX_CFG
165
1
TX_CFG
165
1
HW_CFG
165
1
RX_DP_CTRL
165
1
RX_FIFO_INF
0
0
TX_FIFO_INF
495
3
PMT_CTRL
1155
7
GPIO_CFG
165
1
GPT_CFG
165
1
GPT_CNT
495
3
ENDIAN
165
1
FREE_RUN
660
4
RX_DROP
0
0
MAC_CSR_CMD
165
1
MAC_CSR_DATA
165
1
AFC_CFG
165
1
E2P_CMD
165
1
E2P_DATA
165
1
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