TMS320VC5507ZAY datasheet(40/139 Pages) TI1

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Functional Overview

April 2004 − Revised January 2008

SPRS244J

Table 3−5. External Bus Selection Register Bit Field Description (Continued)

BITS

DESCRIPTION

EMIF hold

HOLD = 0:

DSP drives the external memory bus

HOLD = 1:

Request the external memory bus to be placed in high-impedance so that another device can

drive the memory bus

EMIF hold acknowledge.

HOLDA = 0:

DSP indicates that a hold request on the external memory bus has occured, the EMIF

completed any pending external bus activity, and placed the external memory bus signals in

high-impedance state (address bus, data bus, CE[3:0], AOE, AWE, ARE, SDRAS, SDCAS,

SDWE, SDA10, CLKMEM). Once this bit is cleared, an external device can drive the bus.

HOLDA = 1:

No hold acknowledge

SDRAM CKE pin selection bit.

CKE SEL = 0: Use XF for SDRAM CKE signal

CKE SEL = 1: Use GPIO.4 for SDRAM CKE signal

SDRAM CKE enable bit.

CKE EN = 0:

XF or GPIO.4 operates in normal mode

CKE EN = 1:

Based on the CKE SEL bit, either XF or GPIO.4 drives the SDRAM CKE pin

SDRAM self-refresh command.

SR CMD = 0:

EMIF will not issue a SDRAM self-refresh command

SR CMD = 1:

EMIF will issue a SDRAM self-refresh command

5−2

Reserved. Must be kept as 0000 during any writes to EBSR.

1−0

Parallel port mode. EMIF/HPI/GPIO Mode. Determines the mode of the parallel port.

Parallel Port Mode = 00: Data EMIF mode. The 16 EMIF data signals and 13 EMIF control signals are

routed to the corresponding external parallel bus data and control signals. The

14 (LQFP) or 16 (BGA) address bus signals can be used as general-purpose I/O

only.

Parallel Port Mode = 01: Full EMIF mode. The 14 (LQFP) or 21 (BGA) address signals, 16 data signals, and

15 control signals are routed to the corresponding external parallel bus address,

data, and control signals.

Parallel Port Mode = 10: Non-multiplexed HPI mode. The HPI is enabled an its 14 address signals,

16 data signals, and 7 control signals are routed to the corresponding address,

data, control signals of the external parallel bus. Moreover, 8 control signals of the

external parallel bus are used as general-purpose I/O.

Parallel Port Mode = 11: Multiplexed HPI mode. The HPI is enabled and its 16 data signals and

10 control signals are routed to the external parallel bus. In addition, 3 control

signals of the external parallel bus are used as general-purpose I/O. The

14 (LQFP) or 16 (BGA) external parallel port address bus signals are used as

general-purpose I/O.

† Function available when the port or pins configured as input.

TMS320VC5507ZAY Datasheet(PDF) 40 Page - Texas Instruments

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