C2H Channel Control (0x04) - 4.1 English

DMA/Bridge Subsystem for PCI Express Product Guide (PG195)

Document ID
PG195
Release Date
2023-11-24
Version
4.1 English
Table 1. C2H Channel Control (0x04)
Bit Index Default Access Type Description
31:28 Reserved
27 0x0 RW Disables the metadata writeback for C2H AXI4-Stream. No effect if the channel is configured to use AXI Memory Mapped.
26 0x0 RW

pollmode_wb_enable

Poll mode writeback enable.

When this bit is set, the DMA writes back the completed descriptor count when a descriptor with the Completed bit set, is completed.

25 1’b0 RW

non_inc_mode

Non-incrementing address mode. Applies to m_axi_araddr interface only.

23:19 5’h0 RW

ie_desc_error

Set to all 1s (0x1F) to enable logging of Status.Desc_error and to stop the engine if the error is detected.

13:9 5’h0 RW

ie_read_error

Set to all 1s (0x1F) to enable logging of Status.Read_error and to stop the engine if the error is detected

8:7     Reserved
6 1’b0 RW

ie_idle_stopped

Set to 1 to enable logging of Status.Idle_stopped

5 1’b0 RW

ie_invalid_length

Set to 1 to enable logging of Status.Invalid_length

4 1’b0 RW

ie_magic_stopped

Set to 1 to enable logging of Status.Magic_stopped

3 1’b0 RW

ie_align_mismatch

Set to 1 to enable logging of Status.Align_mismatch

2 1’b0 RW

ie_descriptor_completed

Set to 1 to enable logging of Status.Descriptor_completed

1 1’b0 RW

ie_descriptor_stopped

Set to 1 to enable logging of Status.Descriptor_stopped

0 1’b0 RW

Run

Set to 1 to start the SGDMA engine. Reset to 0 to stop the transfer, if the engine is busy it completes the current descriptor.

  1. The ie_* register bits are interrupt enabled. When these bits are set and the corresponding condition is met, the status will be logged in the C2H Channel Status (0x40). When proper interrupt masks are set (per C2H Channel Interrupt Enable Mask (0x90) ), the interrupt will be generated.