参数资料
型号: DS21Q43AT
厂商: DALLAS SEMICONDUCTOR
元件分类: Digital Transmission Controller
英文描述: DATACOM, FRAMER, PQFP128
封装: TQFP-128
文件页数: 12/60页
文件大小: 748K
代理商: DS21Q43AT
DS21Q43A
2 of 60
1.0 INTRODUCTION
The DS21Q43A Quad E1 Framer is made up of five main parts: framer #0, framer #1, framer #2, framer
#3, and the control port which is shared by all four framers. See the Block Diagram in Figure 1-1. Each
of the four framers within the DS21Q43A maintains the same register structure that appeared in the
DS2143. The two framer-select inputs (FS0 and FS1) are used to determine which framer within the
DS21Q43A is being accessed. In this manner, software written for the DS2143 can also be used in the
DS21Q43A with only slight modifications. Several new features have been added to the framers in the
DS21Q43A over the DS2143.
ADDED FEATURE
SECTION
Non-multiplexed parallel control port operation
2 and 13
Transmit side elastic store
10
Expanded access to Sa and Si bits
6
Control signals RFSYNC, RMSYNC, and TFSYNC
1
FAS word error counting
5
Code violation counting
5
Automatic AIS generation upon loss of frame sync
3
Automatic remote alarm generation
3
Per-channel signaling insertion
9 and 11
Per-channel loopback from RSER to TSER
8 and 11
Option to update error counters every 62.5 ms
5
CRC4 resync criteria met status bit
4
Elastic store reset
10
Hardware 3-state control
1
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