J721E DMA Device Descriptions

Introduction

This chapter provides information on the DMA devices in the J721E SoC. Some System Firmware TISCI messages take device specific inputs. This chapter provides information on the valid values for DMA TISCI message parameters.

DMA Device IDs

Some System Firmware TISCI message APIs require the DMA device ID be provided as part of the request. Based on J721E Device IDs these are the valid DMA device IDs.

DMA Device Name DMA Device ID
J721E_DEV_NAVSS0_UDMAP_0 212
J721E_DEV_MCU_NAVSS0_UDMAP_0 236

DMA Channel and Flow Indices

This section describes valid DMA channel indexes for each DMA channel type. Receive flow index range type information is also described if applicable to the DMA being described.

Warning

Resources marked as reserved for use by DMSC cannot be assigned to a host within the RM Board Configuration resource assignment array. The RM Board Configuration is rejected if an overlap with a reserved resource is detected.

NAVSS0_UDMAP_0

Tx Channel Type Tx Channel Index Range
TX_UHCHAN 0 to 3
TX_HCHAN 4 to 15
TX_CHAN 16 to 139
TX_ECHAN 140 to 299
Rx Channel Type Rx Channel Index Range
RX_UHCHAN 0 to 3
RX_HCHAN 4 to 15
RX_CHAN 16 to 139

NOTE: The host that owns configurable, also known as common or shared, flows is able to delegate them to another host for configuration in order to aid some use case configurations. The configurable flows can be delegated using TISCI_MSG_RM_UDMAP_FLOW_DELEGATE

Rx Flow Type Rx Flow Index Range
DEFAULT 0 to 139
CONFIGURABLE 140 to 299

MCU_NAVSS0_UDMAP_0

Tx Channel Type Tx Channel Index Range
TX_HCHAN 0 to 1
TX_CHAN 2 to 45
TX_CHAN (RESERVED BY SYSTEM FIRMWARE) 46 to 47
Rx Channel Type Rx Channel Index Range
RX_HCHAN 0 to 1
RX_CHAN 2 to 44
RX_CHAN (RESERVED BY SYSTEM FIRMWARE) 45 to 47

NOTE: The host that owns configurable, also known as common or shared, flows is able to delegate them to another host for configuration in order to aid some use case configurations. The configurable flows can be delegated using TISCI_MSG_RM_UDMAP_FLOW_DELEGATE

Rx Flow Type Rx Flow Index Range
DEFAULT 0 to 44
DEFAULT (RESERVED BY SYSTEM FIRMWARE) 45 to 47
CONFIGURABLE 48 to 95