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PCI7621 Datasheet(PDF) 186 Page - Texas Instruments |
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PCI7621 Datasheet(HTML) 186 Page - Texas Instruments |
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186 / 298 page  8−6 8.3 Asynchronous Transmit Retries Register The asynchronous transmit retries register indicates the number of times the PCI7x21/PCI7x11 controller attempts a retry for asynchronous DMA request transmit and for asynchronous physical and DMA response transmit. See Table 8−4 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 RW RW RW RW RW RW RW RW RW RW RW RW Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Register: Asynchronous transmit retries Offset: 08h Type: Read/Write, Read-only Default: 0000 0000h Table 8−4. Asynchronous Transmit Retries Register Description BIT FIELD NAME TYPE DESCRIPTION 31−29 secondLimit R The second limit field returns 0s when read, because outbound dual-phase retry is not implemented. 28−16 cycleLimit R The cycle limit field returns 0s when read, because outbound dual-phase retry is not implemented. 15−12 RSVD R Reserved. Bits 15−12 return 0s when read. 11−8 maxPhysRespRetries RW 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. The default value for this field is 0h. 7−4 maxATRespRetries RW 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. The default value for this field is 0h. 3−0 maxATReqRetries RW 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. The default value for this field is 0h. 8.4 CSR Data Register The CSR data register accesses 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 Register: CSR data Offset: 0Ch Type: Read-only Default: XXXX XXXXh |
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