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: 43/156页
文件大小: 1826K
代理商: TMS320C2812ZHHS
Electrical Specifications
137
April 2001 Revised October 2005
SPRS174M
Table 641. XHOLD/XHOLDA Timing Requirements (XCLKOUT = 1/2 XTIMCLK)§
MIN
MAX
UNIT
td(HL-HiZ)
Delay time, XHOLD low to Hi-Z on all Address, Data, and Control
4tc(XTIM)+tc(XCO)
ns
td(HL-HAL)
Delay time, XHOLD low to XHOLDA low
4tc(XTIM+2tc(XCO)
ns
td(HH-HAH)
Delay time, XHOLD high to XHOLDA high
4tc(XTIM)
ns
td(HH-BV)
Delay time, XHOLD high to Bus valid
6tc(XTIM)
ns
When a low signal is detected on XHOLD, all pending XINTF accesses will be completed before the bus is placed in a high-impedance state.
The state of XHOLD is latched on the rising edge of XTIMCLK.
§ After the XHOLD is detected low or high, all bus transitions and XHOLDA transitions will occur with respect to the rising edge of XCLKOUT. Thus,
for this mode where XCLKOUT = 1/2 XTIMCLK, the transitions can occur up to 1 XTIMCLK cycle earlier than the maximum value specified.
XCLKOUT
(1/2 XTIMCLK)
XHOLD
XR/W,
XZCS0AND1,
XZCS2,
XZCS6AND7
XD[15:0]
Valid
XHOLDA
td(HL-HiZ)
td(HH-HAH)
High-Impedance
XA[18:0]
Valid
High-Impedance
td(HH-BV)
td(HL-HAL)
High-Impedance
See Note A
See Note B
NOTES:
A All pending XINTF accesses are completed.
B Normal XINTF operation resumes.
Figure 637. XHOLD/XHOLDA Timing Requirements (XCLKOUT = 1/2 XTIMCLK)
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