SCD1283 INTEL [Intel Corporation], SCD1283 Datasheet - Page 69
SCD1283
Manufacturer Part Number
SCD1283
Description
IEEE 1284-Compatible Parallel Interface
Manufacturer
INTEL [Intel Corporation]
Datasheet
1.SCD1283.pdf
(94 pages)
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7.4.5
Datasheet
NegOK
7
Bit
3:0
7
6
5
4
Negotiation Status Register
The results of negotiation attempts are stored in this register.
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
The lower 4 bits contain a result code, which shows the current mode.
NegFl
Negotiation Status
6
3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
NSR
R/W
2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
HostTO
Bits
5
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Invalid
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
4
IEEE 1284-Compatible Parallel Interface — CD1283
Compatible mode — no negotiation.
Failed negotiation.
Compatible mode — termination of a 1284 mode.
Reserved.
EPP mode.
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
Description
3
4-bit negotiation result code
Description
2
29
00
1
0
69
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