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参数资料
型号： TMS320C2812ZHHS
厂商： TEXAS INSTRUMENTS INC
元件分类： 数字信号处理
英文描述： 16-BIT, 150 MHz, OTHER DSP, PBGA179
封装： LEAD FREE, BGA-179
文件页数： 70/156页
文件大小： 1826K
代理商： TMS320C2812ZHHS
Introduction
20
April 2001 Revised October 2005
SPRS174M
Table 22. Signal Descriptions (Continued)
NAME
DESCRIPTION
PU/PD§
I/O/Z
PIN NO.
NAME
DESCRIPTION
PU/PD§
I/O/Z
128-PIN
PBK
176-PIN
PGF
179-PIN
GHH
XINTF SIGNALS (2812 ONLY) (CONTINUED)
XMP/MC
F1
17
I
PD
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
E7
159
I
PU
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
82
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
P1
44
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
88
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 6 and Zone 7 Chip Select. XZCS6AND7 is active
(low) when an access to the XINTF Zone 6 or Zone 7 is
performed.
XWE
N11
84
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
M3
42
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
N4
51
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.
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