ADSP-21362/ADSP-21363/ADSP-21364/ADSP-21365/ADSP-21366
Table 21. 16-Bit Memory Read Cycle
K and B Grade
Y Grade
Parameter
Min
Max
Min
Max
Unit
Timing Requirements
t DRS
t DRH
AD15–0 Data Setup Before RD High 3.3
AD15–0 Data Hold After RD High 0
4.5
0
ns
ns
Switching Characteristics
t ALEW
t ADAS 1
t ALERW
ALE Pulse Width 2 × t PCLK – 2.0
AD15–0 Address Setup Before ALE Deasserted t PCLK – 2.5
ALE Deasserted to Read Asserted 2 × t PCLK – 3.8
2 × t PCLK – 2.0
t PCLK – 2.5
2 × t PCLK – 3.8
ns
ns
ns
t RRH 2
Delay Between RD Rising Edge to Next Falling
H + t PCLK – 1.4
H + t PCLK – 1.4
ns
Edge
t ADAH
t RWALE
t RDDRV
1
Read Deasserted to ALE Asserted F + H + 0.5
ALE Address Drive After Read High F + H + t PCLK – 2.3
AD15–0 Address Hold After ALE Deasserted t PCLK – 2.3
F + H + 0.5
F + H + t PCLK – 2.3
t PCLK – 2.3
ns
ns
ns
t ALEHZ1
t RW
ALE Deasserted to Address/Data15–0 in High-Z t PCLK
RD Pulse Width D – 2.0
t PCLK + 3.0 t PCLK
D – 2.0
t PCLK + 3.8
ns
ns
D = (The value set by the PPDUR Bits (5–1) in the PPCTL register) × t PCLK
H = t PCLK (if a hold cycle is specified, else H = 0)
F = 7 × t PCLK (if FLASH_MODE is set, else F = 0)
1
2
On reset, ALE is an active high cycle. However, it can be configured by software to be active low.
This parameter is only available when in EMPP = 0 mode.
ALE
t ALEW
t ALERW
t RWALE
t RRH
RD
t RW
WR
t ALEHZ
t RDDRV
t ADAS
t ADAH
t DRS
t DRH
AD15–0
VALID ADDRESS
VALID DATA
VALID DATA
VALID
ADDRESS
NOTE: FOR 16-BIT MEMORY READS, WHEN EMPP
0, ONLY ONE RD PULSE OCCURS BETWEEN ALE CYCLES.
WHEN EMPP = 0, MULTIPLE RD PULSES OCCUR BETWEEN ALE CYCLES. FOR COMPLETE INFORMATION,
SEE THE ADSP-2136x SHARC PROCESSOR HARDWARE REFERENCE.
Figure 18. Read Cycle for 16-Bit Memory Timing
Rev. J |
Page 26 of 60 |
July 2013
相关PDF资料
ADZS-21371-EZLITE KIT EVAL EZLITE ADZS-21371
ADZS-21469-EZLITE KIT EVAL EZ LITE ADSP-21469
ADZS-21479-EZLITE KIT EVAL EZ BOARD ADSP-2147X
ADZS-21489-EZLITE KIT EVAL EZ BOARD ADSP-2148X
ADZS-218X-ICE-2.5V EMULATOR SRL FOR ADDS-218X-ICE
ADZS-BF506F-EZLITE KIT EVAL EZLITE ADSP-BF506F
ADZS-BF518F-EZLITE KIT EZ LITE BF512F/14F/16F/18F
ADZS-BF527-EZLITE BOARD EVAL ADSP-BF527
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