AX88796ALF datasheet(66/68 Pages) ASIX

66 / 68 page

AX88796ALF

3-in-1 Local Bus Fast Ethernet Controller

3. When /RDY not connect, following steps must include in driver when “READ” data port

A minimum delay 7 LCLKs must wait between Remote DMA read command ready and 1

st data valid. Or modify

Remote DMA read command order as below. No need a minimum delay 7 LCLKs when using new remote DMA

read command order.

Special restrictions on back-to-back read/write cycle if /RDY did not connect to CPU

The host processor (CPU) is required to wait the specified period of time behind some special register access.

Performing “dummy” reads of “Reserved” register (such as offset 1Ch) is a convenient way to guarantee that the

minimum wait time restriction is met. The table below also shows the number of dummy reads that are required

for back-to-back access behind some special register access. It can be ignored “dummy” delay if host processor

back-to-back Tcycle is longer than AX88796A internal busy.

RESISTER NAME

Wait for

AX88796A BUSY

(In LCLK count)

Or perform this read

of Reserved register

(Assuming Tcycle of

3 LCLK)

COMMAND

CR (00h)

2.5

Write CR

Page0 (03h)

2.5

Write BNRY

Page0 (07h)

2.5

Write ISR

Page0 (08h)

2.5

Write RSAR0

Page0 (09h)

2.5

Write RSAR1

Page0 (0Ah)

2.5

Write RBCR0

Page0 (0Bh)

2.5

Write RBCR1

Page1 (07h)

2.5

Write CPR

DP (10h)

2.5

Write Data Port

Page0 (0Dh)

2.5

Read (0Dh)

Reserved

Page0 (0Eh)

2.5

Read CRC error

counter

Page0 (0Fh)

2.5

Read Miss Packet

counter

DP (10H)

2.5

Read Data Port

Reset (1Fh)

2.5

Read (1Fh) Software

reset

ORGINAL

WRITE RSAR1

WRITE RSAR0

WRITE RBCR1

WRITE RBCR0

WRITE CR (remote read)

READ

New Remote DMA read command order

WRITE RSAR1

WRITE RSAR0

WRITE CR (remote read)

WRITE RBCR1

WRITE RBCR0

READ

LCLK/XTALIN

AX88796A internal busy

/READ or /WRITE

“dummy” reads of

“Reserved” register

AX88796ALF Arkusz danych(PDF) 66 Page - ASIX Electronics Corporation

AX88796ALF Arkusz danych(HTML) 66 Page - ASIX Electronics 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

Arkusz danych Pobierz

Link URL