TMS320VC5510 datasheet(29/86 Pages) TI

29 / 86 page

Functional Overview

June 2000 − Revised July 2004

SPRS076J

3.2.3 Enhanced Host Port Interface (EHPI)

The 5510 EHPI provides a 16-bit parallel interface to a host with the following features:

•

20-bit host address bus

•

16-bit host data bus

•

Multiplexed and non-multiplexed bus modes

•

Host access to on-chip SARAM, on-chip DARAM, and external memory

•

20-bit address register (in multiplexed mode) with autoincrement capability for faster transfers

•

Multiple address/data strobes provide a glueless interface to a variety of hosts

•

HRDY signal for handshaking with host

The 5510 EHPI can access internal DARAM, internal SARAM and a portion of the external memory space.

The EHPI cannot directly access the on-chip peripherals and cannot access the memory-mapped registers

below word address 000060h in DARAM. Note that all memory accesses made though the EHPI are

word-addressed. A map of the memory space accessible by the EHPI is shown in Figure 3−4. The EHPI can

access from word address 000060h to 0FFFFFh. The shaded areas of the memory map are not accessible

by the EHPI.

000000h

000060h

008000h

028000h

100000h

200000h

400000h

Memory Blocks

Memory Mapped

Registers (DARAM)

DARAM

External − CE0

Word Address

600000h

SARAM

External − CE0

External − CE1

External − CE2

External − CE3

Memory Accessible

Through the EHPI

NOTE A: The shaded areas of the memory map are not accessible by the EHPI.

Figure 3−4. EHPI Memory Map

TMS320VC5510 Datasheet(PDF) 29 Page - Texas Instruments

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