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: 59/178页
文件大小: 2247K
代理商: SCD223110QCD
Intelligent Two-Channel LAN and WAN Communications Controller — CD2231
Datasheet
151
8.6.5.13
B Transmit Buffer Status (BTBSTS) — Async Mode
This register contains the status of the associated transmit buffer, and it enables successive buffers
to be passed between the host and the CD2231. Status bits within the register are defined as:
Bit 7
Bus error (set by the CD2231 and cleared by the host CPU)
0 = No bus error.
1 = Bus error occurred on the last transfer; the suspect address is available in
TCBADR.
Bit 6
End of frame (set and cleared by host CPU)
0 = This buffer is not the last in frame/block.
1 = This buffer is the last in frame/block.
Bit 5
The end of a transmit buffer has been reached. This bit is used only for DMA sup-
ported transfer. The end of one of the host supplied transmit buffers has been
reached. This bit is set by the CD2231 and cleared by the host CPU.
Bit 4
Reserved – must be ‘0’.
Bit 3
Append (Asynchronous mode only; set and cleared by the host CPU)
0 = No data is appended to the buffer.
1 = Data can be appended to buffer after tx started.
Bit 2
Reserved – must be ‘0’.
Bit 1
Interrupt
0 = No interrupt required after the buffer is sent.
1 = Interrupt required after the buffer is sent.
Bit 0
Ownership of the transfer buffer (set by the host CPU and cleared by the CD2231)
0 = Buffer not ready to be used by CD2231.
1 = Buffer is ready for CD2231 to transmit.
Register Name: BTBSTS
Register Description: Transmit Buffer ‘B’ Status
Default Value: x’00
Access: Byte Read/Write
Intel Hex Address: x’5D
Motorola Hex Address: x’5E
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Berr
EOF
EOB
0
Append
0
INTR
2231own
相关PDF资料
PDF描述
SCDV5540 5X5 DOT MATRIX DISPLAY, RED, 3.2 mm
SCDV5541 5X5 DOT MATRIX DISPLAY, YELLOW, 3.2 mm
SCDV5543 5X5 DOT MATRIX DISPLAY, GREEN, 3.2 mm
SCF5249LAG120 32-BIT, 120 MHz, RISC PROCESSOR, PQFP144
SCF5250CAG120 32-BIT, 120 MHz, MICROPROCESSOR, PQFP144
相关代理商/技术参数
参数描述
SCD224K122A324F 制造商:Cornell Dubilier Electronics 功能描述:FILM CAPACITOR
SCD224K122A3Z25 制造商:Cornell Dubilier Electronics 功能描述:Cap Film 0.22uF 1200V PP 10% (46.99 X 24.6 X 24.1mm) Screw Mount
SCD224K122A3Z25-F 功能描述:薄膜电容器 1200Vdc .22uF 580Vac RoHS:否 制造商:Cornell Dubilier 产品类型: 电介质:Polyester 电容:0.047 uF 容差:10 % 电压额定值:100 V 系列:225P 工作温度范围:- 55 C to + 85 C 端接类型:Radial 引线间隔:9.5 mm
SCD224K162A3-24 制造商:Cornell Dubilier Electronics 功能描述:FILM CAPACITOR
SCD224K162A324F 制造商:Cornell Dubilier Electronics 功能描述:FILM CAPACITOR