CDB61884 Datasheet, PDF (19/22 Pages) Cirrus Logic – Octal T1/E1/J1 Line Interface Evaluation Board

6.2 E1 120 Ω Mode Setup
CDB61884
Table 5 shows the position of the different switches and jumpers used to set up the CDB61884 evaluation
board to operate in E1 120 Ω Hardware, Serial Host and Parallel Host operational modes. Before selecting
host mode, the switches in Table 5 in bold should be set to the position stated.
Table 5. E1 120 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
HIGH
LOW (Note 4)
LOW (Note 5)
LOW (Note 5)
LOW (Note 5)
LOW (Note 5)
LOW (Note 5)
ANY POSITION
NC (Note 7)
LOW
LOW
LOW
3V
OSCILLATOR
OPEN
OPEN
Serial Host (Note 3)
SERIAL HOST
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
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
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
NC
OPEN
OPEN
OPEN
3V
OSCILLATOR
OPEN
OPEN
7. Set to “NC” to disable receiver Internal line impedance matching function. The external resistors for all
eight receivers must be changed to 15 Ω to properly match the input line impedance.
DS485DB1
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