参数资料
型号: DS21352LB
厂商: Maxim Integrated Products
文件页数: 117/137页
文件大小: 0K
描述: IC TXRX 1-CHIP T1 3.3V 100-LQFP
产品培训模块: Lead (SnPb) Finish for COTS
产品变化通告: Product Discontinuation 20/Feb/2012
标准包装: 90
功能: 单芯片收发器
接口: HDLC,T1
电路数: 1
电源电压: 3.14 V ~ 3.47 V
电流 - 电源: 75mA
工作温度: 0°C ~ 70°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
80 of 137
TDC2: TRANSMIT HDLC DS0 CONTROL REGISTER 2 (Address=93 Hex)
(MSB)
(LSB)
TDB8
TDB7
TDB6
TDB5
TDB4
TDB3
TDB2
TDB1
SYMBOL
POSITION
NAME AND DESCRIPTION
TDB8
TDC2.7
DS0 Bit 8 Suppress Enable. MSB of the DS0. Set to one to stop this bit from
being used.
TDB7
TDC2.6
DS0 Bit 7 Suppress Enable. Set to one to stop this bit from being used.
TDB6
TDC2.5
DS0 Bit 6 Suppress Enable. Set to one to stop this bit from being used.
TDB5
TDC2.4
DS0 Bit 5 Suppress Enable. Set to one to stop this bit from being used.
TDB4
TDC2.3
DS0 Bit 4 Suppress Enable. Set to one to stop this bit from being used.
TDB3
TDC2.2
DS0 Bit 3 Suppress Enable. Set to one to stop this bit from being used.
TDB2
TDC2.1
DS0 Bit 2 Suppress Enable. Set to one to stop this bit from being used.
TDB1
TDC2.0
DS0 Bit 1 Suppress Enable. LSB of the DS0. Set to one to stop this bit from
being used.
15.4 LEGACY FDL SUPPORT
15.4.1 OVERVIEW
In order to provide backward compatibility to the older DS2152 device, the DS21352/552 maintains the
circuitry that existed in the previous generation of the T1 Quad Framer. Sections 15.4.2 and 15.4.3 cover
the circuitry and operation of this legacy functionality. In new applications, it is recommended that the
HDLC controller and BOC controller described in Section 15.3 are used. On the receive side, it is
possible to have both the new HDLC/BOC controller and the legacy hardware working at the same time.
On the transmit side the HDLC/BOC controller can be assigned to a DSO while the legacy function
supports the FDL via software. Software for supporting the legacy functions is available from Dallas
Semiconductor.
15.4.2 RECEIVE SECTION
In the receive section, the recovered FDL bits or Fs bits are shifted bit–by–bit into the Receive FDL
register (RFDL). Since the RFDL is 8 bits in length, it will fill up every 2 ms (8 times 250 us). The framer
will signal an external microcontroller that the buffer has filled via the SR2.4 bit. If enabled via IMR2.4,
the INT pin will toggle low indicating that the buffer has filled and needs to be read. The user has 2 ms to
read this data before it is lost. If the byte in the RFDL matches either of the bytes programmed into the
RFDLM1 or RFDLM2 registers, then the SR2.2 bit will be set to a one and the INT pin will toggled low
if enabled via IMR2.2. This feature allows an external microcontroller to ignore the FDL or Fs pattern
until an important event occurs.
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