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LPC47M192 数据表(PDF) 39 Page - SMSC Corporation

部件名 LPC47M192
功能描述  LPC SUPER I/O WITH HARDWARE MONITORING BLOCK
PDF  228 Pages
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制造商  SMSC [SMSC Corporation]
网页  http://www.smsc.com
标志 SMSC - SMSC Corporation

LPC47M192 数据表(HTML) 39 Page - SMSC Corporation

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SMSC DS – LPC47M192
Page 39
Rev. 03/30/05
DATASHEET
Table 11 – FIFO Service Delay
FIFO THRESHOLD
EXAMPLES
MAXIMUM DELAY TO SERVICING AT
2 Mbps DATA RATE
1 byte
2 bytes
8 bytes
15 bytes
1 x 4 us - 1.5 us = 2.5 us
2 x 4 us - 1.5 us = 6.5 us
8 x 4 us - 1.5 us = 30.5 us
15 x 4 us - 1.5 us = 58.5 us
FIFO THRESHOLD
EXAMPLES
MAXIMUM DELAY TO SERVICING AT
1 Mbps DATA RATE
1 byte
2 bytes
8 bytes
15 bytes
1 x 8 us - 1.5 us = 6.5 us
2 x 8 us - 1.5 us = 14.5 us
8 x 8 us - 1.5 us = 62.5 us
15 x 8 us - 1.5 us = 118.5 us
FIFO THRESHOLD
EXAMPLES
MAXIMUM DELAY TO SERVICING AT
500 Kbps DATA RATE
1 byte
2 bytes
8 bytes
15 bytes
1 x 16 us - 1.5 us = 14.5 us
2 x 16 us - 1.5 us = 30.5 us
8 x 16 us - 1.5 us = 126.5 us
15 x 16 us - 1.5 us = 238.5 us
DIGITAL INPUT REGISTER (DIR)
Address 3F7 READ ONLY
This register is read-only in all modes.
PC-AT Mode
7
6
5
4
3
2
1
0
DSK
CHG
0
0
0
0
0
0
0
RESET
COND.
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
BIT 0 – 6 UNDEFINED
The data bus outputs D0 – 6 are read as ‘0’.
BIT 7 DSKCHG
This bit monitors the pin of the same name and reflects the opposite value seen on the disk cable or the value
programmed in the Force Disk Change Register (see Runtime Register at offset 0x1E).
PS/2 Mode
7
6
5
4
3
2
1
0
DSK
CHG
1
1
1
1
DRATE
SEL1
DRATE
SEL0
nHIGH
DENS
RESET
COND.
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1
BIT 0 nHIGH DENS
This bit is low whenever the 500 Kbps or 1 Mbps data rates are selected, and high when 250 Kbps and 300 Kbps are
selected.



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