TMS320DM647_0804 datasheet(47/182 Pages) TI

47 / 182 page

3.3 Pullup/Pulldown Resistors

TMS320DM647/TMS320DM648

Digital Media Processor

www.ti.com

SPRS372B – MAY 2007 – REVISED APRIL 2008

Table 3-10. MAC_ADDR_R1 Register Field Descriptions (continued)

Bit

Field

Value

Description

23:16

Reserved

0x00

Reserved

15:0

MAC_ID

Mac

Bit 0 of MAC_ID is Bit 32 of MAC Address

Address[47:32] of

the device

Figure 3-9. MAC_ADDR_RW0 Register

MAC_ADDR_R0

R/W - MAC ID[31:0]

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Table 3-11. MAC_ADDR_RW0 Register Field Descriptions

Bit

Field

Value

Description

31:0

MAC_ID

Mac

Bit 0 of MAC_ID is bit 0 of MAC Address

Address[31:0] of

the device

Figure 3-10. MAC_ADDR_RW1 Register

CRC

Reserved

R/W-CRC for the MAC_ID

R/W-00000000

MAC_ID

R-MAC ADDRESS[47:32]

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Table 3-12. MAC_ADDR_RW1 Register Field Descriptions

Bit

Field

Value

Description

31:24

CRC

CRC of the

This field will hold the CRC of the MAC address of that particular device.

MAC ID

23:16

Reserved

0x00

Reserved

15:0

MAC_ID

Mac

Bit 0 of MAC_ID is Bit 32 of MAC Address

Address[47:32]

of the device

Proper board design should specify that input pins to the device always be at a valid logic level and not

floating. This may be achieved via pullup/pulldown resistors. The device features internal pullup (IPU) and

internal pulldown (IPD) resistors on most pins to eliminate the need, unless otherwise noted, for external

pullup/pulldown resistors.

An external pullup/pulldown resistor must be used in the following situations:

• Boot and Configuration Pins: If the pin is both routed out and in high-impedance mode, an external

pullup/pulldown resistor must be used, even if the IPU/IPD matches the desired value/state.

• Other Input Pins: If the IPU/IPD does not match the desired value/state, use an external

pullup/pulldown resistor to pull the signal to the opposite rail.

If the boot and configuration pins are both routed out and in high-impedance mode, it is recommended

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