FDC37M607 datasheet(35/182 Pages) SMSC

35 / 182 page

true when the FIFO has <threshold> bytes

remaining in the FIFO. The FDC will also

deactivate the FDRQ pin when TC becomes true

(qualified by nDACK), indicating that no more

data is required.

FDRQ goes inactive after

nDACK goes active for the last byte of a data

transfer (or on the active edge of nIOW of the

last byte, if no edge is present on nDACK). A

data overrun may occur if FDRQ is not removed

in time to prevent an unwanted cycle.

Data Transfer Termination

The FDC supports terminal count explicitly

through the TC pin and implicitly through the

underrun/overrun

and

end-of-track

(EOT)

functions.

For full sector transfers, the EOT

parameter can define the last sector to be

transferred in a single or multi-sector transfer.

If the last sector to be transferred is a partial

sector, the host can stop transferring the data in

mid-sector, and the FDC will continue to

complete the sector as if a hardware TC was

received.

The only difference between these

implicit functions and TC is that they return

"abnormal termination" result status.

Such

status indications can be ignored if they were

expected.

Note that when the host is sending data to the

FIFO of the FDC, the internal sector count will

be complete when the FDC reads the last byte

from its side of the FIFO. There may be a delay

in the removal of the transfer request signal of

up to the time taken for the FDC to read the last

16 bytes from the FIFO. The host must tolerate

this delay.

Result Phase

The

generation

FINT

determines

the

beginning of the result phase. For each of the

commands, a defined set of result bytes has to

be read from the FDC before the result phase is

complete. These bytes of data must be read out

for another command to start.

RQM and DIO must both equal "1" before the

result bytes may be read.

After all the result

bytes have been read, the RQM and DIO bits

switch to "1" and "0" respectively, and the CB bit

is cleared, indicating that the FDC is ready to

accept the next command.

FDC37M607 Datasheet(PDF) 35 Page - SMSC Corporation

FDC37M607 Datasheet(HTML) 35 Page - SMSC Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL