AMD Am186 CC User Manual page 140

Table 8-2 DMA Controller Register Summary (Continued)
Register
Offset
Mnemonic
SmartDMA Channel Pair 0 and 1 Registers
140h SD0CON
142h SD0TRCAL
144h SD0TRAH
146h SD0RRCAL
148h SD0RRAH
14Ah SD0STAT
14Ch SD0CBD
14Eh SD0CTAD
150h SD0CRAD
158h SD1CON
15Ah SD1TRCAL
15Ch SD1TRAH
15Eh SD1RRCAL
160h SD1RRAH
162h SD1STAT
164h SD1CBD
166h SD1CTAD
168h SD1CRAD
8-6
DMA Controller
Register Name
CC CH
SmartDMA0 Control
SmartDMA0 Transmit Ring Count /
Address Low
SmartDMA0 Transmit Ring Address
High
SmartDMA0 Receive Ring Count /
Address Low
SmartDMA0 Receive Ring Address
High
SmartDMA0 Status
SmartDMA0 Current Buffer Descriptor
SmartDMA0 Current Transmit Address
SmartDMA0 Current Receive Address
SmartDMA1 Control
SmartDMA1 Transmit Ring Count /
Address Low
SmartDMA1 Transmit Ring Address
High
SmartDMA1 Receive Ring Count /
Address Low
SmartDMA1 Receive Ring Address
High
SmartDMA1 Status
SmartDMA1 Current Buffer Descriptor
SmartDMA1 Current Transmit Address
SmartDMA1 Current Receive Address
Am186™CC/CH/CU Microcontrollers User's Manual
Description
Sets up SmartDMA Channel 0.
Indicates the number of available buffer
descriptors per transmit ring in SmartDMA
Channel 0.
Also contains the low address bits [15–4] of the
transmit buffer descriptor ring address for
SmartDMA Channel 0.
Points to the transmit buffer descriptor ring high
address bits [19–16] for SmartDMA Channel 0.
Indicates the number of available buffer
descriptors per receive ring in SmartDMA
Channel 0.
Also contains the low address bits [15–4] of the
receive buffer descriptor ring address for
SmartDMA Channel 0.
Points to the receive buffer descriptor ring high
address bits [19–16] for SmartDMA Channel 0.
Indicates the status of SmartDMA Channel 0.
Indicates the buffer descriptor currently
accessed by SmartDMA Channel 0.
Indicates the current address of the data being
transmitted by SmartDMA Channel 0.
Indicates the current address of the data being
received by a SmartDMA channel.
Behaves the same as SmartDMA Channel 0
registers, but for SmartDMA Channel 1.