2-16
Connections Listing—CP55 to DA20 (See fold-out Figure 2.9)
Audio from DA20 to CP55
CP55 to DA20 Sense/Control
DA20
CP Audio out Conn. J8 (DB25 Male)
Pin no.
CP55 TB1
1 AGND
GND
2 Rs out
CP55 backplane Cat. No. 241 pin M
3 AGND
4 AGND
5 AGND
6 AGND
7 AGND
8 AGND
9 AGND
10 AGND
11 AGND
12 AGND
13 AGND
14 L out
L from Aux
15 Ls out
S from Aux
16 Re out
17 R out
R from Aux
18 Le out
19 n.c.
20 C out
C from Aux
21 S out
22 n.c.
23 n.c.
24 SW out
CP55 Cat. No. 241 Pin R
25 Spare out
DA20 J6 DB25
Male
Pinout
CP55 Cat. No. 321 TB2
Fanning Strip
1 Ctrl0
S0 (01 - mono optical)
2 Ctrl1
S1 (05 - Dolby SR)
3 Ctrl2
S2 (04 - Dolby Stereo)
4 Ctrl3
S3
5 Ctrl4
S4 (22 - mag)
6 Ctrl5
S5
7 Ctrl6
S6 (60 - non-sync.)
8 Ctrl7
S7 (10 - Dolby Digital)
9 n.c
10 n.c
11 n.c
12 GND
GND
13 n.c
14 Sense0
15 n.c.
16 n.c.
17 n.c.
18 n.c.
19 n.c.
20 n.c.
21 n.c.
22 n.c.
23 n.c.
24 n.c.
25 C/O Status (CP55 backplane TB2) Auto C/O
Format sense and control is accomplished via connection of CP S0 through S7 lines,
connected to DA20 CTRL0 through CTRL7. The DA20 monitors CTRL lines and asserts
formats depending on the mode of operation of the DA20. Valid format assertions are
detected when any one CTRL line is low for greater than 80ms. See the DA20 Users’
Manual for specific information related to the DA20 modes of operation and the Auto
Digital feature.
The DA20 switches to format 05 by holding CTRL1 low for approximately 150ms and
returns to format 10 by holding CTRL 7 low for approximately 150ms. (The CP55 requires
about 50ms to switch formats.)
