Cirrus Logic CDB53L21 - Manual (Page 13)

DS700DB1 13
CDB53L21
3. HARDWARE MODE CONTROL
The CDB may be configured without the use of a software control port through the use of two switches, “FPGA H/W
Control” and “CS53L21 H/W Control.” These switches are enabled in Hardware Mode only and ignored in Software
Mode. The CDB53L21 automatically enters Hardware Mode upon initial power up, or when exiting Software Mode,
by terminating the Cirrus FlexGUI software or by disconnecting the RS-232 serial cable or USB cable.
3.1 FPGA H/W Control
The “FPGA H/W Control” switch S3 sets up the CDB in 4 pre-defined routing topologies in Hardware Mode.
The tables and figures below describe each switch setting. The At-A-Glance Controls table provides a quick
reference for all presets.
Notes:
1. The S[1] setting affects FPGA signal routing only and is independent of the M/S setting of the “CS53L21
H/W Control” switch S5. These settings must be made manually by the user and have to be consistent.
At-A-Glance Controls
S[3:2] S[1] (See Note 1.) S[0]
00 - Reserved
0 - CS53L21 Slave Routing
1 - CS53L21 Master Routing 0 - No Loopback Routing
1 - Reserved
01 - I/O Header MCLK / I/O Header clocks/data route through
FPGA
10 - Oscillator MCLK / I/O Header clocks/data route through FPGA
11 - Reserved
Signal
Routing
S[3:0] General Description Detailed Description
0 0000 Reserved
1 0001 Reserved
2 0010 Reserved
3 0011 Reserved
I/O MCLK
4
Figure 6
0100 I/O Clocks/Data
1) I/O masters MCLK. 2) I/O masters PCM clocks.
3) SDOUT to CS8406 and I/O Header
5 0101 Reserved
6
Figure 7
0110 CS53L21 Clocks, I/O Data
1) I/O masters MCLK. 2) CS53L21 masters PCM clocks.
3) SDOUT to CS8406 and I/O Header
7 0111 Reserved
Oscillator MCLK
8
Figure 8
1000 I/O Clocks/Data
1) Oscillator masters MCLK. 2) I/O masters PCM clocks.
3) SDOUT to CS8406 and I/O Header
9 1001 Reserved
10
Figure 9
1010 CS53L21 Clocks, I/O Data
1) Oscillator masters MCLK. 2) CS53L21 masters PCM clocks.
3) SDOUT to CS8406 and I/O Header
11 1011 Reserved
12-15 Reserved
Table 1. MCLK and Clock/Data Routing Options