TMS320DM641 Datasheet, PDF (68/171 Pages) Texas Instruments – Video/Imaging Fixed-Point Digital Signal Processors

Device Configurations
2 Device Configurations
On the DM641/DM640 device, bootmode and certain device configurations/peripheral selections are
determined at device reset, while other device configurations/peripheral selections are software-configurable
via the peripheral configurations register (PERCFG) [address location 0x01B3F000] after device reset.
2.1 Configurations at Reset
For proper device operation; the following external pins must be configured correctly:
• For proper DM641 device operation, the HD5 [pin Y1] at device reset must be pulled down via a 10-kΩ
resistor.
• For proper DM641/DM640 device operation, the reserved (RSV) [E2] pin at device reset must be pulled
down via a 10-kΩ resistor.
• For proper DM641/DM640 device operation, the GP0[0] [pin M5] (IPD) must remain low at device reset.
2.1.1 Peripheral Selection at Device Reset
On the DM641/DM640 devices there are NO peripherals sharing the same pins (internally muxed, yet mutually
exclusive) that are controlled via external pins.
• EMAC and MDIO peripherals
The MAC_EN pin is latched at reset. This pin determines specific peripheral selection, summarized in
Table 2−1.
Table 2−1. MAC_EN Peripheral Selection (EMAC and MDIO)
PERIPHERAL SELECTION
MAC_EN
Pin [C5]
0
1
PERIPHERALS SELECTED
HPI Data
(16-Bit) [DM641 Only]
EMAC and MDIO
√
Disabled
√
√
68 _SPRS222C
June 2003 − Revised August 2004