Parallel Observability During Functional Mode - Texas Instruments OMAP5912 Reference Manual

2.3

Parallel Observability During Functional Mode

SPRU752B
Table 8. Functional Multiplexing Modes
FUNC_MUX_CTRL Corresponding Multiplexing Mode for
3-Bit Value Pin Configuration
000 Default configuration/functional multiplexing 0
001 Functional pin multiplexing mode 1
010 Functional pin multiplexing mode 2
011 Functional pin multiplexing mode 3
100 Functional pin multiplexing mode 4
101 Functional pin multiplexing mode 5
110 Functional pin multiplexing mode 6
111 Functional pin multiplexing mode 7
For a given interface, the values of the FUNC_MUX_CTRL bits may vary from
pin to pin. For example, the USB1_HOST port is split between functional
multiplexing 1 and functional multiplexing 2 columns. In this case, four of the
pins have a mode value of 001, and the other four have a mode value of 010.
Note:
The programming of a pin in a mux mode that is not defined in the pinout sec-
tion of the Application Processor Data Manual (SPRS231) leads to unde-
fined operation of the pin, and thus must be strictly avoided.
For debug purposes, various internal signals can be brought to the boundary
during functional mode. The software procedure for enabling observability of
internal signals is as follows:
Set FUNC_MUX_CTRL_2.CONF_OBS_MUX_SEL_R, depending
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on the signal that must be observed (see Table 9).
Set FUNC_MUX_CTRL_0.OBS_288_1 bit to 1.
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There is no need to write 0xEAEF to COMP_MODE_CTRL_0 to set
observability mode. Table 9 gives the observable signals, and their locations
on the boundary, depending on CONF_OBS_MUX_SEL_R.
Configuration
Initialization 31