SCD1283 datasheet(69/94 Pages) INTEL

69 / 94 page

IEEE 1284-Compatible Parallel Interface — CD1283

Datasheet

7.4.5

Negotiation Status Register

The results of negotiation attempts are stored in this register.

NSR

Negotiation Status

R/W

NegOK

NegFl

HostTO

Invalid

4-bit negotiation result code

Bit

Description

NegOK: The state of this bit indicates that the negotiation was successful.

Negotiation Failed: The state of this bit indicates that the negotiation failed. The result code indicates which

mode attempted.

Host Timeout: This bit indicates that a host time-out occurred on the parallel channel. The accompanying 4-

bit result code indicates that the link has returned to Compatibility mode (x02). See description of HTVR on

page 59.

Invalid: The state of this bit indicates that the state machine is in an invalid state due to the last negotiation

sequence and has reentered Compatibility mode

3:0

The lower 4 bits contain a result code, which shows the current mode.

Bits

Description

210

Compatible mode — no negotiation.

Failed negotiation.

Compatible mode — termination of a 1284 mode.

011

Reserved.

100

101

EPP mode.

111

Reserved.

Reverse Nibble mode

Reverse Nibble mode — ID request.

Reverse Byte mode.

Reverse Byte mode — ID request

ECP mode without RLE

ECP mode without RLE — ID request

ECP mode with RLE

ECP mode with RLE — ID request

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