DS21FT40 Datasheet, PDF (1/87 Pages) Dallas Semiconductor – Four x Three 12 Channel E1 Framer

DS21FT40
Four x Three 12 Channel E1 Framer
www.dalsemi.com
MULTI-CHIP MODULE FEATURES
• Twelve (12) completely independent
E1 Framers in one small 27 mm x 27 mm
Package
• Each Multi-Chip Module (MCM) Contains
Three DS21Q44 Quad E1 Framer Die
• Each Quad Framer can be concatenated into
a Single 8.192 MHz Backplane Data Stream
• 300–pin MCM 1.27 mm pitch BGA package
(27 mm X 27 mm)
• Low Power 3.3V CMOS with 5V Tolerant
Input & Outputs
FRAMER FEATURES
• All framers are fully independent; transmit
and receive sections of each framer are fully
independent
• Frames to FAS, CAS, CCS, and CRC4
formats
• Each framer contains dual two–frame elastic
store slip buffers that can connect to
asynchronous backplanes up to 8.192 MHz
• 8–bit parallel control port that can be used
directly on either multiplexed or non–
multiplexed buses (Intel or Motorola)
• Easy access to Si and Sa bits
• Extracts and inserts CAS signaling
FUNCTIONAL DIAGRAM
Receive
Framer
Elastic
Store
Transmit
Formatter
Elastic
Store
FRAMER #1
FRAMER #2
FRAM_ρρE_ρR #3
FRAMER #12
Control Port
• Large counters for bipolar and code
violations, CRC4 code word errors, FAS
word errors, and E-bits
• Programmable output clocks for Fractional
E1, per channel loopback, H0 and H12
applications
• Integral HDLC controller with 64-byte
buffers. Configurable for Sa bits or DS0
operation
• Detects and generates AIS, remote alarm,
and remote multiframe alarms
• IEEE 1149.1 support
DESCRIPTION
The DS21FT40 MCM offers a high density packaging arrangement for the DS21Q44 E1 Enhanced Quad
Framer. Three DS21Q44 silicon die are packaged in a Multi-Chip Module (MCM) with the electrical
connections as shown in Figure 1-1. The DS21FT40 is closely related to the DS21FT44. Most of the
functions of the DS21FT44 are available on the DS21FT40. The differences are listed in Table 1-1.
Table 2-1 lists all of the signals on the MCM.
The DS21Q44 E1 Framer is an enhanced version of the DS21Q43 Quad E1 Framer. Each DS21Q44 die
contains four framers that are configured and read through a common microprocessor-compatible parallel
port. Each framer consists of a receive framer, receive elastic store, transmit formatter and transmit
elastic store. All four framers in the DS21Q44 are totally independent, they do not share a common
framing synchronizer. Also, the transmit and receive sides of each framer are totally independent. The
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