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AD0345BS8500RF Fiches technique(PDF) 41 Page - Texas Instruments

No de pièce AD0345BS8500RF
Description  RAD-TOLERANT CLASS-V FLOATING-POINT DIGITAL SIGNAL PROCESSOR
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

AD0345BS8500RF Fiches technique(HTML) 41 Page - Texas Instruments

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DSP Owns Bus
External Requester
DSP Owns Bus
’C6701
Ext Req
’C6701
8
7
3
4
6
6
1
2
CLKOUT1
HOLD
HOLDA
EMIF Bus(1)
1
5
9
2
SMJ320C6701-SP
www.ti.com
SGUS030F – APRIL 2000 – REVISED SEPTEMBER 2013
HOLD/HOLDA TIMING
Timing Requirements for the Hold/Hold Acknowledge Cycles
(1)
(see Figure 24)
NO.
MIN
MAX
UNIT
1
tsu(HOLDH–CKO1H)
Setup time, HOLD high before CLKOUT1 high
5
ns
2
th(CKO1H–HOLDL)
Hold time, HOLD low after CLKOUT1 high
2
ns
(1)
HOLD is synchronized internally. Therefore, if setup and hold times are not met, it will either be recognized in the current cycle or in the
next cycle. Thus, HOLD can be an asynchronous input.
Switching Characteristics for the Hold/Hold Acknowledge Cycles
(1)
(seeFigure 24)
NO.
PARAMETER
MIN
MAX
UNIT
3
tR(HOLDL–EMHZ)
Response time, HOLD low to EMIF high impedance
4P
(2)ns
4
tR(EMHZ–HOLDAL)
Response time, EMIF high impedance to HOLDA low
2P
ns
5
tR(HOLDH–HOLDAH)
Response time, HOLD high to HOLDA high
4P
7P
ns
6
td(CKO1H–HOLDAL)
Delay time, CLKOUT1 high to HOLDA valid
1
8
ns
7
td(CKO1H–BHZ)
Delay time, CLKOUT1 high to EMIF Bus high impedance(3)
1(4)
8(4)
ns
8
td(CKO1H–BLZ)
Delay time, CLKOUT1 high to EMIF Bus low impedance(3)
1(4)
12(4)
ns
9
tR(HOLDH–BLZ)
Response time, HOLD high to EMIF Bus low impedance(3)
3P
6P
ns
(1)
P = 1/CPU clock frequency in ns. For example, when running parts at 140 MHz, use P = 7 ns.
(2)
All pending EMIF transactions are allowed to complete before HOLDA is asserted. The worst cases for this is an asynchronous read or
write with external ARDY used or a minimum of eight consecutive SDRAM reads or writes when RBTR8 = 1. If no bus transactions are
occurring, then the minimum delay time can be achieved. Also, bus hold can be indefinitely delayed by setting the NOHOLD = 1.
(3)
EMIF Bus consists of CE[3:0], BE[3:0], ED[31:0], EA[21:2], ARE, AOE, AWE, SSADS, SSOE, SSWE, SDA10, SDRAS, SDCAS, and
SDWE.
(4)
This parameter is not tested.
(1)
EMIF bus consists of CE[3:0], BE[3:0], ED[31:0], EA[21:2], ARE, AOE, AWE, SSADS, SSOE, SSWE, SDA10,
SDRAS, SDCAS, and SDWE.
Figure 24. HOLD/HOLDA Timing
Copyright © 2000–2013, Texas Instruments Incorporated
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41
Product Folder Links: SMJ320C6701-SP


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