Host Controller Data Manual

4–6

4.3 Asynchronous Transmit Retries Register

The asynchronous transmit retries register indicates the number of times the TSB12LV26 attempts a retry for

asynchronous DMA request transmit and for asynchronous physical and DMA response transmit. See Table 4–4 for

a complete description of the register contents.

Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

Name Asynchronous transmit retries

Type R R R R R R R R R R R R R R R R

Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Name Asynchronous transmit retries

Type R R R R R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W

Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Type: Read/Write, Read-only

Offset: 08h

Default: 0000 0000h

Table 4–4. Asynchronous Transmit Retries Register Description

BIT FIELD NAME TYPE DESCRIPTION

31–29 secondLimit R The second limit field returns 0s when read, since outbound dual-phase retry is not implemented.

28–16 cycleLimit R The cycle limit field returns 0s when read, since outbound dual-phase retry is not implemented.

15–12 RSVD R Reserved. Bits 15–12 return 0s when read.

11–8 maxPhysRespRetries R/W

This field tells the physical response unit how many times to attempt to retry the transmit operation

for the response packet when a busy acknowledge or ack_data_error is received from the target

node.

7–4 maxATRespRetries R/W

This field tells the asynchronous transmit response unit how many times to attempt to retry the

transmit operation for the response packet when a busy acknowledge or ack_data_error is

received from the target node.

3–0 maxATReqRetries R/W

This field tells the asynchronous transmit DMA request unit how many times to attempt to retry the

transmit operation for the response packet when a busy acknowledge or ack_data_error is

received from the target node.

4.4 CSR Data Register

The CSR data register is used to access the bus management CSR registers from the host through compare-swap

operations. This register contains the data to be stored in a CSR if the compare is successful.

Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

Name CSR data

Type R R R R R R R R R R R R R R R R

Default X X X X X X X X X X X X X X X X

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Name CSR data

Type R R R R R R R R R R R R R R R R

Default X X X X X X X X X X X X X X X X

Type: Read-only

Offset: 0Ch

Default: XXXX XXXXh