TMS320F2811 datasheet(18/173 Pages) TI

18 / 173 page

Introduction

April 2001 − Revised July 2007

SPRS174O

Table 2−2. Signal Descriptions† (Continued)

NAME

DESCRIPTION

PU/PD§

I/O/Z‡

PIN NO.

NAME

DESCRIPTION

PU/PD§

I/O/Z‡

128-PINP

176-PINP

179-PING

XINTF SIGNALS (2812 ONLY) (CONTINUED)

XMP/MC

−

Microprocessor/Microcomputer

Mode

Select.

Switches

between

microprocessor

and

microcomputer mode. When high, Zone 7 is enabled

on the external interface. When low, Zone 7 is

disabled from the external interface, and on-chip

boot ROM may be accessed instead. This signal is

latched into the XINTCNF2 register on a reset and

the user can modify this bit in software. The state of

the XMP/MC pin is ignored after reset.

XHOLD

159

−

External Hold Request. XHOLD, when active (low),

requests the XINTF to release the external bus and

place all buses and strobes into a high-impedance

state. The XINTF will release the bus when any

current access is complete and there are no pending

accesses on the XINTF.

XHOLDA

K10

−

O/Z

−

External Hold Acknowledge. XHOLDA is driven

active (low) when the XINTF has granted a XHOLD

request. All XINTF buses and strobe signals will be

in a high-impedance state. XHOLDA is released

when the XHOLD signal is released. External

devices should only drive the external bus when

XHOLDA is active (low).

XZCS0AND1

−

O/Z

−

XINTF Zone 0 and Zone 1 Chip Select. XZCS0AND1

is active (low) when an access to the XINTF Zone 0

or Zone 1 is performed.

XZCS2

P13

−

O/Z

−

XINTF Zone 2 Chip Select. XZCS2 is active (low)

when an access to the XINTF Zone 2 is performed.

XZCS6AND7

B13

133

−

O/Z

−

XINTF

Zone

and

Zone

Chip

Select.

XZCS6AND7 is active (low) when an access to the

XINTF Zone 6 or Zone 7 is performed.

XWE

N11

−

O/Z

−

Write Enable. Active-low write strobe. The write

strobe waveform is specified, per zone basis, by the

Lead, Active, and Trail periods in the XTIMINGx

registers.

XRD

−

O/Z

−

Read Enable. Active-low read strobe. The read

strobe waveform is specified, per zone basis, by the

Lead, Active, and Trail periods in the XTIMINGx

registers. NOTE: The XRD and XWE signals are

mutually exclusive.

XR/W

−

O/Z

−

Read Not Write Strobe. Normally held high. When

low, XR/W indicates write cycle is active; when high,

XR/W indicates read cycle is active.

† Typical drive strength of the output buffer for all pins is 4 mA except for TDO, XCLKOUT, XF, XINTF, EMU0, and EMU1 pins, which are 8 mA.

‡ I = Input, O = Output, Z = High impedance

§ PU = pin has internal pullup; PD = pin has internal pulldown. Pullup/pulldown strength is given in Section 6.3. The pullups/pulldowns are enabled

in boundary scan mode.

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