TMS320DM643 datasheet(87/162 Pages) TI

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5.8.2

EMIF Peripheral Register Description(s)

5.8.3

EMIF Electrical Data/Timing

TMS320DM643

Video/Imaging Fixed-Point Digital Signal Processor

SPRS269C – FEBRUARY 2005 – REVISED JANUARY 2007

Table 5-20. EMIFA Registers

HEX ADDRESS RANGE

ACRONYM

COMMENTS

0180 0000

GBLCTL

EMIFA global control

0180 0004

CECTL1

EMIFA CE1 space control

0180 0008

CECTL0

EMIFA CE0 space control

0180 000C

–

Reserved

0180 0010

CECTL2

EMIFA CE2 space control

0180 0014

CECTL3

EMIFA CE3 space control

0180 0018

SDCTL

EMIFA SDRAM control

0180 001C

SDTIM

EMIFA SDRAM refresh control

0180 0020

SDEXT

EMIFA SDRAM extension

0180 0024 – 0180 003C

–

Reserved

0180 0040

PDTCTL

Peripheral device transfer (PDT) control

0180 0044

CESEC1

EMIFA CE1 space secondary control

0180 0048

CESEC0

EMIFA CE0 space secondary control

0180 004C

–

Reserved

0180 0050

CESEC2

EMIFA CE2 space secondary control

0180 0054

CESEC3

EMIFA CE3 space secondary control

0180 0058 – 0183 FFFF

–

Reserved

5.8.3.1

Asynchronous Memory Timing

Table 5-21. Timing Requirements for Asynchronous Memory Cycles for EMIFA Module

(1) (2)

(see Figure 5-19 and Figure 5-20)

–500

–600

NO.

UNIT

MIN

MAX

tsu(EDV-AREH)

Setup time, AEDx valid before AARE high

6.5

th(AREH-EDV)

Hold time, AEDx valid after AARE high

tsu(ARDY-EKO1H)

Setup time, AARDY valid before AECLKOUTx high

th(EKO1H-ARDY)

Hold time, AARDY valid after AECLKOUTx high

2.5

(1)

To ensure data setup time, simply program the strobe width wide enough. AARDY is internally synchronized. The AARDY signal is only

recognized two cycles before the end of the programmed strobe time and while AARDY is low, the strobe time is extended

cycle-by-cycle. When AARDY is recognized low, the end of the strobe time is two cycles after AARDY is recognized high. To use

AARDY as an asynchronous input, the pulse width of the AARDY signal should be wide enough (e.g., pulse width = 2E) to ensure setup

and hold time is met.

(2)

RS = Read setup, RST = Read strobe, RH = Read hold, WS = Write setup, WST = Write strobe, WH = Write hold. These parameters

are programmed via the EMIF CE space control registers.

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DM643 Peripheral Information and Electrical Specifications

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