TMS320DM6437_17 Datasheet, PDF (119/306 Pages) Texas Instruments – Digital Media Processor

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TMS320DM6437
Digital Media Processor
SPRS345D – NOVEMBER 2006 – REVISED JUNE 2008
3.7.3.5 GPIO Block Muxing
This block of 4 pins consists of PCI and GPIO muxed pins. The PINMUX1.PCIEN register field selects the
pin functions in the GPIO Block.
Table 3-25 summarizes the 4 pins in the GPIO Block, the multiplexed function on each pin, and the
PINMUX configurations to select the corresponding function.
Table 3-25. GPIO Block Muxed Pins Selection
SIGNAL
MULTIPLEXED FUNCTIONS
PCI
GPIO
NAME
FUNCTION
SELECT
FUNCTION
SELECT
AD0/GP[0]
AD0
GP[0]
AD1/GP[1]
AD2/GP[2]
AD1
AD2
PCIEN = 1⁽¹⁾
GP[1]
GP[2]
PCIEN = 0⁽¹⁾
AD4/GP[3]
AD4
GP[3]
(1) If PCIEN = 1, the internal pullup/pulldown on all GPIO Block pins are disabled. If PCIEN = 0, the internal pullup/pulldown on all GPIO
Block pins are enabled.
As discussed in Section 3.7.3.2, Peripherals Spanning Multiple Pin Mux Blocks, PCI pins span across the
following Pin Mux Blocks: Host Block, EMIFA/VPSS Block Sub-Block 0 and Sub-Block 3, PCI Data Block,
and GPIO Block. For proper PCI operation, PCI must be selected in all of these Pin Mux Blocks.
Table 3-26 provides a different view of the GPIO Block pin muxing, showing the GPIO Block function
based on PINMUX1.PCIEN setting. The selection options are also shown pictorially in Figure 3-11.
PINMUX1.PCIEN
0
1
Table 3-26. GPIO Block Function Selection
BLOCK FUNCTION
PCI
(Default if PCIEN = 1)
GPIO (4)
(Default if PCIEN = 0)
RESULTING PIN FUNCTIONS
PCI: AD0, AD1, AD2, AD4
GPIO: GP[3:0]
The PINMUX1.PCIEN field is read-only, and its setting is determined by the PCIEN configuration pin.
Based on the PCIEN configuration pin setting, the 4 pins in the GPIO Block defaults to either PCI or GPIO
function.
In addition, the VDD3P3V_PWDN.GPIO field determines the power state of the GPIO Block pins. The
GPIO Block pins default to powered up. For more details on the VDD3P3V_PWDN.GPIO field, see
Section 3.2, Power Considerations.
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Device Configurations 119