PPC34C60 datasheet(48/58 Pages) SMSC

48 / 58 page

SMSC DS – PPC34C60

Page 48

Rev. 06/01/2001

ADVANCED INFORMATION

FIGURE 19 - ECP FORWARD DATA TRANSFER TIMING

(ECP DATA WRITE, PARALLEL PORT SIGNALS)

See ECP Forward Data Transfer Timing Parameters

ECP FORWARD DATA TRANSFER TIMING

(ECP DATA WRITE, PARALLEL PORT SIGNALS)

PARAMETER

MIN

TYP

MAX

UNITS

The PPC34C60 indicates it is ready to

receive another byte of data from the Host

by deasserting BSY. The Host if and when

ready will place a byte on HD[0:7]. This

time is the time required between the

deassertion of BSY and data on HD[0:7].

[SCLK]

The Host places data on HD[0:7] and at the

same time deasserts nALF to indicate that

this is a Data transfer.

After placing data on HD[0:7] and

deasserting nALF, the host is required to

meet this setup time before asserting

nSTB.

Assetion of nSTB informs the

PPC34C60 that valid data is on HD[0:7]

and that nALF is valid.

The peripheral acknowledges by asserting

BSY.

334

[8 SCLK]

Once

the

peripheral

has

sent

its

acknowledgement the Host deasserts

nSTB to continue the handshake.

The

PPC34C60 latches the data on this rising

edge of nSTB.

[SCLK]

As soon as the PPC34C60 has accepted

the data and is ready to accept another

byte it deasserts the BSY signal.

334

[8 SCLK]

VALID DATA

HD[0:7]

nSTB H

nALF H

nSEL H

nINIT H

BSY P

nACK P

PE P

SLCT P

nERR P

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