NH82801DBSL8DE 869490 Intel, NH82801DBSL8DE 869490 Datasheet - Page 207
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NH82801DBSL8DE 869490
Manufacturer Part Number
NH82801DBSL8DE 869490
Description
Manufacturer
Intel
Datasheet
1.NH82801DBSL8DE_869490.pdf
(587 pages)
Specifications of NH82801DBSL8DE 869490
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Intel
®
82801DB ICH4 Datasheet
5.17.10.1.2 IN Transactions
An IN transaction receives data from the debug device. It can occur only when the following are
true:
The sequence of the transaction is:
2. The debug port controller sends a token packet consisting of
3. After sending the token packet, the debug port controller sends a data packet consisting of
4. After sending the data packet, the controller waits for a handshake response from the debug
1. Software sets the appropriate values in the following bits:
•
•
•
•
•
device.
If a handshake is received, the debug port controller:
If no handshake PID is received, the debug port controller:
The debug port is enabled
The debug software sets the GO_CNT bit
The WRITE_READ#_CNT bit is reset
— SYNC
— TOKEN_PID_CNT field
— USB_ADDRESS_CNT field
— USB_ENDPOINT_CNT field
— 5-bit CRC field
— SYNC
— SEND_PID_CNT field
— The number of data bytes indicated in DATA_LEN_CNT from the DATA_BUFFER
— 16-bit CRC
— a. Places the received PID in the RECEIVED_PID_STS field
— b. Resets the ERROR_GOOD#_STS bit
— c. Sets the DONE_STS bit
— a. Sets the EXCEPTION_STS field to 001b
— b. Sets the ERROR_GOOD#_STS bit
— c. Sets the DONE_STS bit
— USB_ADDRESS_CNF
— USB_ENDPOINT_CNF
— TOKEN_PID_CNT[7:0]
— DATA_LEN_CNT
— WRITE_READ#_CNT (note: this will always be 0 for IN transactions)
— GO_CNT (note: this will always be 1 to initiate the transaction)
Note: A DATA_LEN_CNT value of zero is valid in which case no data bytes would be
included in the packet.
Functional Description
207
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