SPEAR1340 datasheet(179/200 Pages) STMICROELECTRONICS

部件名	SPEAR1340

功能描述	Dual-core Cortex A9 HMI embedded MPU

PDF	200 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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179 / 200 page

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

Setup time for DQS/DQ receive data

214

Hold time DQS/DQ receive data

449

Signals at memory interface

DQS

Signals at PHY interface

DQS sampled pattern

DQS edge

detection

max

error

DQS

data skew

DQ sampled pattern

Nominal center

of DQ window

00 0

111

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