LPC47M192 datasheet(39/228 Pages) SMSC

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

DSK

CHG

RESET

COND.

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

DSK

CHG

DRATE

SEL1

DRATE

SEL0

nHIGH

DENS

RESET

COND.

N/A

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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