AX88796 datasheet(45/71 Pages) ASIX

45 / 71 page

ASIX ELECTRONICS CORPORATION

AX88796 L

3-in-1 Local Bus Fast Ethernet Controller

5.2.8 MR7 –Next Page Transmit Register Bit Descriptions

FIELD

TYPE

DESCRIPTION

7.15 (NEXT_PAGE)

R/W

Next Page. This bit indicates whether or not this is the last next page to be

transmitted. When this bit is 0, it indicates that this is the last page. When

this bit is 1, it indicates there is an additional next page.

7.14 (ACK)

Acknowledge. This bit is the acknowledge bit from the link code word.

7.13 (MESSAGE)

R/W

Message Page. This bit is used to differentiate a message page from an

unformatted page. When this bit is 0, it indicates an unformatted page.

When this bit is 1, it indicates a formatted page.

7.12 (ACK2)

R/W

Acknowledge 2. This bit is used by the next page function to indicate that a

device has the ability to comply with the message. It is set as follows:

When this bit is 0, it indicates the device cannot comply with the message.

When this bit is 1, it indicates the device will comply with the message.

7.11 (TOGGLE)

Toggle. This bit is used by the arbitration function to ensure

synchronization with the link partner during next page exchange. This bit

will always take the opposite value of the toggle bit in the previously

exchanged link code word:

If the bit is logic 0, the previous value of the transmitted link code word was

logic 1.

If the bit is a 1, the previous value of the transmitted link code word was a 0.

The initial value of the toggle bit in the first next page transmitted is the

inverse of the value of bit 11 in the base link code word, and may assume a

value of 1 or 0.

7.10:0 (MCF)

R/W

Message/Unformatted Code Field. With these 11 bits, there are 2048

possible messages. Message code field definitions are described in annex

28C of the IEEE 802.3u standard.

5.2.9 MR16 – PCS Control Register Bit Descriptions

FIELD

TYPE

DESCRIPTION

16.15 (LOCKED)

Locked. Locked pin from descrambler block.

16.14-12 (UNUSED)

Unused. Will always be read back as 0.

16.11-4 (TESTBITS)

R/W

Generic Test Bits. These bits have no effect on the PCS block. They are for

external use only. A 0 should be written to these bits.

16.3 (LOOPBACK)

R/W

Loopback Configure. When this bit is high, the entire loopback is

performed in the PCS macro. When this bit is low, only the collision pin is

disabled in loopback.

16.2 (SCAN)

R/W

Scan Test Mode.

16.1

(FORCE

LOOPBACK)

R/W

Force Loopback. Force a loopback without forcing idle on the transmit side

or disabling the collision pin.

16.0 (SPEEDUP

COUNTERS)

R/W

Speedup Counters. Reduce link monitor counter to 10 us from 620 us.

(Same as FASTTEST = 1.)

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