| 전자부품 데이터시트 검색엔진 |
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LPC47M192 데이터시트(PDF) 39 Page - SMSC Corporation |
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LPC47M192 데이터시트(HTML) 39 Page - SMSC Corporation |
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39 / 228 page ![]() 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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