ds21ft40 Maxim Integrated Products, Inc., ds21ft40 Datasheet - Page 19

• Manufacturer Part Number: ds21ft40
• Description: Ds21ft40 Four X Three 12 Channel E1 Framer
• Manufacturer: Maxim Integrated Products, Inc.

Signal Name:
Signal Description:
Signal Type:
Must be low to read or write to a specific DS21Q44 die. These are active low signals.
Signal Name:
Signal Description:
Signal Type:
WR* is an active low signal.
TEST ACCESS PORT PINS
Signal Name:
Signal Description:
Signal Type:
Set high to 3–state all output and I/O pins (including the parallel control port). Set low for normal
operation. Useful in board level testing.
SUPPLY PINS
Signal Name:
Signal Description:
Signal Type:
2.97 to 3.63 volts.
Signal Name:
Signal Description:
Signal Type:
0.0 volts.
3. DS21FT40 REGISTER MAP
Register Map for Each Quad Framer Sorted by Address Table 3-1
ADDRESS
0A
0B
0C
00
01
02
03
04
05
06
07
08
09
R/W
R/W
R/W
R/W
R/W
R
R
R
R
R
R
–
–
–
BPV or Code Violation Count 1
BPV or Code Violation Count 2
CRC4 Error Count 1 / FAS Error Count 1
CRC4 Error Count 2
E-Bit Count 1 / FAS Error Count 2
E-Bit Count 2
Status 1
Status 2
Receive Information
Test 2
Not used
Not used
Not used
CS1* TO CS3*
Chip Select
Input
WR* (R/W*)
Write Input (Read/Write)
Input
TEST
3–State Control
Input
VDD
Positive Supply
Supply
VSS
Signal Ground
Supply
REGISTER NAME
19 of 87
ABBREVIATION
TEST2 (set to 00h)
REGISTER
(set to 00H)
(set to 00H)
(set to 00H)
CRCCR2
CRCCR1
EBCR1
EBCR2
VCR1
VCR2
SR1
SR2
RIR
DS21FT40