参数资料
型号: SCD223110QCD
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 2 CHANNEL(S), 256K bps, SERIAL COMM CONTROLLER, PQFP100
封装: METRIC, QFP-100
文件页数: 52/178页
文件大小: 2247K
代理商: SCD223110QCD
Intelligent Two-Channel LAN and WAN Communications Controller — CD2231
Datasheet
145
8.6.4.10
Receive Current Buffer Address Register — Upper (RCBADRU)
These registers contain the address of the current DMA buffer being used for receive data, updated
at the end of receive data transfers. These registers are for the private use of the CD2231 to manage
DMA transfers. In Asynchronous mode, the host can read this register during a receive exception
interrupt to determine how much data is in the buffer. The address is the location of the next
character to be transferred to the buffer. The host needs this information to process newly arrived
data in the buffer if used in Append mode, and a data timeout has occurred. The address is also
needed if an exception has occurred, and a gap is to be left in the DMA (see the description of the
Gap bits in Section 8.5.2.7 on page 131) for the insertion of status information by the host. For a
bus error during receive data transfer, this register provides the start address of the transfer causing
the bus error.
8.6.5
DMA Transmit Registers
8.6.5.1
A Transmit Buffer Address Register — Lower (ATBADRL)
Register Name: RCBADRU
Register Description: Current Receive Buffer Address, upper word
Default Value: x’0000
Access: Word Read Only
Intel Hex Address: x’3E
Motorola Hex Address: x’3C
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Binary address value, 32-bit address, bits 31:24
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Binary address value, 32-bit address, bits 23:16
Register Name: ATBADRL
Register Description: Transmit Buffer ‘A’ 32-bit Address, lower word
Default Value: x’0000
Access: Word Read/Write
Intel Hex Address: x’50
Motorola Hex Address: x’52
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Binary address value, 32-bit address, bits 15:8
Bit 7
Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1Bit 0
Binary address value, 32-bit address, bits 7:0
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