参数资料
型号: DS21552LN+
厂商: Maxim Integrated Products
文件页数: 6/137页
文件大小: 0K
描述: IC TXRX T1 1-CHIP 5V 100-LQFP
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 90
功能: 单芯片收发器
接口: E1,HDLC,J1,T1
电路数: 1
电源电压: 4.75 V ~ 5.25 V
电流 - 电源: 75mA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 100-LQFP
供应商设备封装: 100-LQFP(14x14)
包装: 托盘
包括: DSX-1 和 CSU 线路补偿发生器,HDLC 控制器,带内回路代码发生器和检测器
DS21352/DS21552
103 of 137
IDCODE
When the IDCODE instruction is latched into the parallel instruction register, the identification test
register is selected. The device identification code will be loaded into the identification register on the
rising edge of JTCLK following entry into the Capture-DR state. Shift-DR can be used to shift the
identification code out serially via JTDO. During Test-Logic-Reset, the identification code is forced into
the instruction register’s parallel output. The ID code will always have a ‘1’ in the LSB position. The
next 11 bits identify the manufacturer’s JEDEC number and number of continuation bytes followed by 16
bits for the device and 4 bits for the version. See Table 19-2. Table 19-3 lists the device ID codes for the
SCT devices.
Table 19-2 ID CODE STRUCTURE
MSB
LSB
Version
Contact Factory
Device ID
JEDEC
1
4 bits
16bits
00010100001
1
Table 19-3 DEVICE ID CODES
DEVICE
16-BIT ID
DS21354
0005h
DS21554
0003h
DS21352
0004h
DS21552
0002h
19.4 TEST REGISTERS
IEEE 1149.1 requires a minimum of two test registers; the bypass register and the boundary scan register.
An optional test register has been included with the DS21352/552 design. This test register is the
identification register and is used in conjunction with the IDCODE instruction and the Test-Logic-Reset
state of the TAP controller.
BOUNDARY SCAN REGISTER
This register contains both a shift register path and a latched parallel output for all control cells and
digital I/O cells and is n bits in length. See Table 19-4 for all of the cell bit locations and definitions.
BYPASS REGISTER
This is a single one-bit shift register used in conjunction with the BYPASS, CLAMP, and HIGHZ
instructions which provides a short path between JTDI and JTDO.
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