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| 型号： | DS21FF44 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 88/117页 |
| 文件大小： | 0K |
| 描述： | IC FRAMER E1 4X4 16CH 300-BGA |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 40 |
| 控制器类型： | E1 调帧器 |
| 接口： | 并行/串行 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 电流 - 电源： | 300mA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 300-BBGA |
| 供应商设备封装： | 300-PBGA（27x27） |
| 包装： | 管件 |
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DS21FT44/DS21FF44
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register. The read result should be logically AND’ed with the mask byte that was just written and this
value should be written back into the same register to insure that bit does indeed clear. This second write
step is necessary because the alarms and events in the status registers occur asynchronously in respect to
their access by the parallel port. This write-read-write (for polled-driven access) or write–read (for
interrupt driven access) scheme allows an external microcontroller or microprocessor to individually poll
certain bits without disturbing the other bits in the register. This operation is key in controlling the
DS21Q44 with higher order software languages.
Like the SR1 and SR2 status registers, the HSR register has the unique ability to initiate a hardware
interrupt by the INT* output pin. Each of the events in the HSR can be either masked or unmasked from
the interrupt pin by the HDLC Interrupt Mask Register (HIMR). Interrupts will force the INT* pin low
when the event occurs. The INT* pin will be allowed to return high (if no other interrupts are present)
when the user reads the event bit that caused the interrupt to occur.
19.3. BASIC OPERATION DETAILS
As a basic guideline for interpreting and sending HDLC messages, the following sequences can be
applied:
Receive a HDLC Message
1) Enable RPS interrupts.
2) Wait for interrupt to occur.
3) Disable RPS interrupt and enable either RPE, RNE, or RHALF interrupt.
4) Read RHIR to obtain REMPTY status.
a) If REMPTY = 0, then record OBYTE, CBYTE, and POK bits and then read the FIFO
a1) If CBYTE = 0 then skip to Step 5
a2) If CBYTE = 1 then skip to Step 7
b) If REMPTY = 1, then skip to Step 6
5) Repeat Step 4.
6) Wait for interrupt, skip to Step 4.
7) If POK = 0, then discard whole packet, if POK = 1, accept the packet.
8) Disable RPE, RNE, or RHALF interrupt, enable RPS interrupt and return to Step 1.
Transmit a HDLC Message
1) Make sure HDLC controller is done sending any previous messages and is current sending flags by
checking that the FIFO is empty by reading the TEMPTY status bit in the THIR register.
2) Enable either the THALF or TNF interrupt.
3) Read THIR to obtain TFULL status.
a) If TFULL = 0, then write a byte into the FIFO and skip to next step (special case occurs
when the last byte is to be written, in this case set TEOM = 1 before writing the byte and
then skip to Step 6)
b) If TFULL = 1, then skip to Step 5
4) Repeat Step 3.
5) Wait for interrupt, skip to Step 3.
6) Disable THALF or TNF interrupt and enable TMEND interrupt.
7) Wait for an interrupt, then read TUDR status bit to make sure packet was transmitted correctly.
相关PDF资料 |
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| DS21Q42T+ | IC FRAMER ENHANCED T1 4X 128TQFP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS21FF44N | 功能描述:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21FT40 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Four x Three 12 Channel E1 Framer |
| DS21FT40N | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| DS21FT42 | 功能描述:网络控制器与处理器 IC 4x4 16/4x3 12 Chnl T1/T1 Framer RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21FT42N | 功能描述:网络控制器与处理器 IC 4x4 16/4x3 12 Chnl T1/T1 Framer RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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