CDB61884 Datasheet, PDF (20/22 Pages) Cirrus Logic – Octal T1/E1/J1 Line Interface Evaluation Board

6.3 T1/J1 100 Ω Mode Setup
CDB61884
Table 6 shows the position of the different switches and jumpers used to set up the CDB61884 evaluation
board to operate in T1/J1 100 Ω Hardware, Serial Host and Parallel Host operational modes. Before se-
lecting host mode the switches in Table 6 in bold should be set to the position stated.
Table 6. T1/J1 100 Ω Operational Mode Switch/Jumper Position
Switches/Jumpers
S15 (MODE)
S1 (0)
S2 (1)
S3 (2)
S4 (3)
S5 (4)
S6 (5)
S7 (6)
S8 (7)
S9 #1 (MOT_\INTL)
S9 #2 (MUX)
S9 #3 (A4)
S9 #4 (A3)
S9 #5 (A2)
S9 #6 (A1)
S9 #7 (A0)
S10 (JASEL)
S11 (CBLSEL)
S12 (LEN 2)
S13 (LEN 1)
S14 (LEN 0)
J13 (VLOGIC)
J1 (MCLK)
J93 (CLKE)
J23 (TXOE)
Hardware
HARDWARE
LOOP FUNCTION
LOOP FUNCTION
LOOP FUNCTION
LOOP FUNCTION
LOOP FUNCTION
LOOP FUNCTION
LOOP FUNCTION
LOOP FUNCTION
OPEN (HIGH)
LOW (Note 4)
LOW (Note 5)
LOW (Note 5)
LOW (Note 5)
LOW (Note 5)
LOW (Note 5)
ANY POSITION
NC or HIGH (Note 8)
LOW (Note 9)
HIGH (Note 9)
HIGH (Note 9)
3V
OSCILLATOR
OPEN
OPEN
Serial Host (Note 3)
SERIAL HOST
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
OPEN
NC
OPEN
OPEN
OPEN
3V
OSCILLATOR
OPEN
OPEN
Parallel Host (Note 3)
PARALLEL HOST
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
MOTOROLA/INTEL
MUX/NON-MUX
HIGH
HIGH
HIGH
HIGH
HIGH
OPEN
NC
OPEN
OPEN
OPEN
3V
OSCILLATOR
OPEN
OPEN
8. Set “LOW” to disable receiver Internal line impedance matching function. The external resistors for all
eight receivers must be changed to 12.5 Ω to properly match the input line impedance.
9. Selects T1/J1 100 Ω 0ft-133ft line length settings. These pins can be changed to select other T1/J1 100
Ω line length settings. Refer to the CS61884 Data Sheet for other settings.
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DS485DB1