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SPEAR1340 データシート(PDF) 179 Page - STMicroelectronics

部品番号 SPEAR1340
部品情報  Dual-core Cortex A9 HMI embedded MPU
PDF  200 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SPEAR1340 データシート(HTML) 179 Page - STMicroelectronics

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SPEAr1340
Timing characteristics
Doc ID 023063 Rev 4
179/200
The setup time is calculated considering:
●
maximum error = 235 ps
●
maximum data skew = 20 ps
Ts calculation formula
Ts= Tclk/4–data_skew –max_error= 469 ps – 20 ps – 235 ps = 214 ps
The hold time, instead, is calculated considering:
●
maximum error = 0 ps
●
maximum data skew = 20 ps
Th calculation formula
Th= Tclk/4-data_skew + max_error= 469 ps – 20 ps + 0 ps = 449 ps
Figure 40.
DQS and DQ signals timing waveform
Table 92.
DQS and DQ signals timing characteristics
Symbol
Description
Value
Unit
TCLK
Mem_clk period
1.875
ns
Ts
Setup time for DQS/DQ receive data
214
ps
Th
Hold time DQS/DQ receive data
449
ps
Signals at memory interface
DQS
DQ
D0
D1
D2
D3
Signals at PHY interface
DQS sampled pattern
DQS edge
detection
max
error
Th
DQS
DQ
Ts
data skew
DQ sampled pattern
Nominal center
of DQ window
D0
D1
D2
D3
01
00
00 0
11
111
111
1



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