参数资料
型号: TMDXEVM5515
厂商: Texas Instruments
文件页数: 74/159页
文件大小: 0K
描述: EVAL MODULE DSP FOR C55XX
标准包装: 1
类型: DSP
适用于相关产品: TMS320C55x 系列
所含物品: 板,线缆,CD,电源
产品目录页面: 718 (CN2011-ZH PDF)
其它名称: 296-25753
SPRS645F – AUGUST 2010 – REVISED OCTOBER 2013
5.3.2
Digital I/O Behavior When Core Power (CV DD ) is Down
With some exceptions (listed below), all digital I/O pins on the device have special features to allow
powering down of the Digital Core Domain (CV DD ) without causing I/O contentions or floating inputs at the
pins (see Figure 5-3 ). The device asserts the internal signal called HHV high when power has been
removed from the Digital Core Domain (CV DD ). Asserting the internal HHV signal causes the following
conditions to occur in any order:
?
?
?
All output pin strong drivers to go to the high-impedance (Hi-Z) state
Weak bus holders to be enabled to hold the pin at a valid high or low
The internal pullups or pulldowns (IPUs/IPDs) on the I/O pins will be disabled
The exception pins that do not have this special feature are:
?
?
?
Pins driven by the CV DDRTC Power Domain [This power domain is "Always On"; therefore, the pins
driven by CV DDRTC do not need these special features]:
– RTC_XI, RTC_XO, RTC_CLKOUT, and WAKEUP
USB Pins:
– USB_DP, USB_DM, USB_R1, USB_VBUS, USB_MXI, and USB_MXO
Pins for the Analog Block:
– GPAIN[3:0], DSP_LDO_EN, and BG_CAP
DVDD
Y
PAD
A
GZ
OR
hhvgz
HHV
HHV
PI
OR
hhvpi
HHV
Figure 5-3. Bus Holder I/O Circuit
NOTE
Figure 5-3 shows both a pullup and pulldown but pins only have one, not both.
PI = Pullup/Pulldown Inhibit
GZ = Output Enable (active low)
HHV = Described in Section 5.3.2
74
Peripheral Information and Electrical Specifications
Product Folder Links: TMS320C5515
Copyright ? 2010–2013, Texas Instruments Incorporated
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