HEATEVM datasheet(36/79 Pages) TI1

36 / 79 page

SM470R1B1M-HT

SPNS155H – SEPTEMBER 2009 – REVISED SEPTEMBER 2013

www.ti.com

expansion bus module (EBM)

The expansion bus module (EBM) is a standalone module used to bond out both general-purpose input/output

pins and expansion bus interface pins. This module supports the multiplexing of the GIO and the expansion bus

interface functions. The module also supports 8- and 16- bit expansion bus memory interface mappings as well

as mapping of the following expansion bus signals:

•

27-bit address bus (EBADDR[26:0] for x8, 19-bit address bus (EBADDR[18:0] for x16

•

8- or 16-bit data bus (EBDATA[7:0] or EBDATA[15:0])

•

2 write strobes (EBWR[1:0])

•

2 memory chip selects (EBCS[6:5])

•

1 output enable (EBOE)

•

1 external hold signal for interfacing to slow memories (EBHOLD)

•

1 DMA request line (EBDMAREQ[0])

Table 10 shows the multiplexing of I/O signals with the expansion bus interface signals. The mapping of these

pins varies depending on the memory mode.

Table 10. Expansion Bus Mux Mapping(1)

EXPANSION BUS MODULE PINS

GIO

x8(2)

x16(2)

GIOB[0]

EBDMAREQ[0]

GIOC[0]

EBOE

GIOC[2:1]

EBWR[1:0]

GIOC[4:3]

EBCS[6:5]

GIOD[5:0]

EBADDR[5:0]

GIOE[7:0]

EBDATA[7:0]

GIOF[7:0]

EBADDR[13:6]

EBDATA[15:8]

GIOG[7:0]

EBADDR[21:14]

EBADDR[13:6]

GIOH[5]

EBHOLD

I2C5SDA

EBADDR[26]

EBADDR[18]

I2C5SCL

EBADDR[25]

EBADDR[17]

I2C4SCL

EBADDR[24]

EBADDR[16]

I2C4SDA

EBADDR[23]

EBADDR[15]

GIOH[0]

EBADDR[22]

EBADDR[14]

(1)

For more detailed information, see theTMS470R1x Expansion Bus Module (EBM) Reference Guide (literature number SPNU222) and

the TMS470R1x General Purpose Input/Output Reference Guide (literature number SPNU192).

(2)

X8 refers to size of memory in 8-bits; X16 refers to size of memory in 16-bits.

Table 11 lists the names of the expansion bus interface signals and their functions.

Table 11. Expansion Bus Pins

DESCRIPTION

EBDMAREQ

Expansion bus DMA request

EBOE

Expansion bus pin enable

EBWR

Expansion bus write strobe EBWR[1] controls EBDATA[15:8] and EBWR[0]

controls EBDATA[7:0]

EBCS

Expansion bus chip select

EBADDR

Expansion bus address pins

EBDATA

Expansion bus data pins

EBHOLD

Expansion bus hold: An external device may assert this signal to add wait

states to an expansion bus transaction.

Submit Documentation Feedback

HEATEVM Datasheet(PDF) 36 Page - Texas Instruments

HEATEVM Datasheet(HTML) 36 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79

Datasheet Download

Link URL