82NM10 Datasheet, PDF (192/671 Pages) Intel Corporation – Intel® NM10 Family Express Chipset

Functional Description
Table 5-75.Debug Port Behavior (Sheet 2 of 2)
OWNER_CNT ENABLED_CT
1
1
1
1
1
1
1
1
1
1
Port
Enable
0
1
1
1
1
Run /
Stop
1
0
0
1
1
Suspend
Debug Port Behavior
X
Debug port in Mode 2. SOF
(and only SOF) is sent as
keepalive. Debug traffic is
also sent. Note that no other
normal traffic is sent out this
port, because the port is not
enabled.
0
Invalid. Host controller driver
should not put the controller
into this state (enabled, not
running and not suspended).
1
Port is suspended. No debug
traffic sent.
0
Debug port in Mode 2.
Debug traffic is interspersed
with normal traffic.
1
Port is suspended. No debug
traffic sent.
5.19.10.1.1 OUT Transactions
An Out transaction sends data to the debug device. It can occur only when the
following are true:
• The debug port is enabled
• The debug software sets the GO_CNT bit
• The WRITE_READ#_CNT bit is set
The sequence of the transaction is:
1. Software sets the appropriate values in the following bits:
— USB_ADDRESS_CNF
— USB_ENDPOINT_CNF
— DATA_BUFFER[63:0]
— TOKEN_PID_CNT[7:0]
— SEND_PID_CNT[15:8]
— DATA_LEN_CNT
— WRITE_READ#_CNT (note: this will always be 1 for OUT transactions)
— GO_CNT (note: this will always be 1 to initiate the transaction)
2. The debug port controller sends a token packet consisting of:
— SYNC
— TOKEN_PID_CNT field
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