TMS320C6454

Fixed-Point Digital Signal Processor

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SPRS311A –APRIL 2006 –REVISED DECEMBER 2006

Table 2-3. Terminal Functions (continued)

SIGNAL

 

TYPE (1)

IPD/IPU (2)

NAME

NO.

 

 

ACE5

V27

O/Z

IPU

ACE4

V28

O/Z

IPU

ACE3

W26

O/Z

IPU

ACE2

W27

O/Z

IPU

ABE7

W29

O/Z

IPU

ABE6

K26

O/Z

IPU

ABE5

L29

O/Z

IPU

ABE4

L28

O/Z

IPU

ABE3

AA29

O/Z

IPU

ABE2

AA28

O/Z

IPU

ABE1

AA25

O/Z

IPU

ABE0

AA26

O/Z

IPU

DESCRIPTION

EMIFA memory space enables

Enabled by bits 28 through 31 of the word address

Only one pin is asserted during any external data access Note: The C6454 device does not have ACE0 and ACE1 pins

EMIFA byte-enable control

Decoded from the low-order address bits. The number of address bits or byte enables used depends on the width of external memory.

Byte-write enables for most types of memory.

 

 

 

EMIFA (64-BIT) - BUS ARBITRATION

AHOLDA

N26

O

IPU

EMIFA hold-request-acknowledge to the host

AHOLD

R29

I

IPU

EMIFA hold request from the host

ABUSREQ

L27

O

IPU

EMIFA bus request output

 

EMIFA (64-BIT) - ASYNCHRONOUS/SYNCHRONOUS MEMORY CONTROL

 

 

 

 

EMIFA external input clock. The EMIFA input clock (AECLKIN or SYSCLK4

AECLKIN

N29

I

IPD

clock) is selected at reset via the pullup/pulldown resistor on the AEA[15] pin.

 

 

 

 

Note: AECLKIN is the default for the EMIFA input clock.

AECLKOUT

V29

O/Z

IPD

EMIFA output clock [at EMIFA input clock (AECLKIN or SYSCLK4) frequency]

AAWE/ASWE

AB25

O/Z

IPU

Asynchronous memory write-enable/Programmable synchronous interface

write-enable

 

 

 

 

AARDY

K29

I

IPU

Asynchronous memory ready input

AR/W

W25

O/Z

IPU

Asynchronous memory read/write

AAOE/ASOE

Y28

O/Z

IPU

Asynchronous/Programmable synchronous memory output-enable

 

 

 

 

Programmable synchronous address strobe or read-enable

 

 

 

 

For programmable synchronous interface, the r_enable field in the Chip

 

 

 

 

Select x Configuration Register selects between ASADS and ASRE:

ASADS/ASRE

R26

O/Z

IPU

– If r_enable = 0, then the ASADS/ASRE signal functions as the ASADS

 

 

 

 

signal.

– If r_enable = 1, then the ASADS/ASRE signal functions as the ASRE signal.

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Texas Instruments TMS320C6454 Ipd/Ipu, Emifa 64-BIT BUS Arbitration, Emifa 64-BIT ASYNCHRONOUS/SYNCHRONOUS Memory Control