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W631GG6KB
7.13.2.1 READ Timing; Clock to Data Strobe relationship
Clock to Data Strobe relationship is shown in Figure 24 and is applied when the DLL is enabled and
locked.
Rising data strobe edge parameters:
tDQSCK min/max describes the allowed range for a rising data strobe edge relative to CK, CK#.
tDQSCK is the actual position of a rising strobe edge relative to CK, CK#.
tQSH describes the data strobe high pulse width.
Falling data strobe edge parameters:
tQSL describes the data strobe low pulse width.
tLZ(DQS), tHZ(DQS) for preamble/postamble (see section 7.13.2.3 and Figure 26).
RL Measured
to this point
CK/CK#
DQS, DQS#
Erly Strobe
tLZ(DQS)min
tDQSCK(min)
tDQSCK(min)
tDQSCK(min)
tDQSCK(min)
tQSH tQSL
tQSH tQSL
tQSH tQSL
tRPRE
tRPST
tHZ(DQS)min
tLZ(DQS)max
DQS, DQS#
Late Strobe
Bit 0 Bit 1
Bit 2
Bit 3
Bit 4 Bit 5
Bit 6
Bit 7
tDQSCK(max)
tDQSCK(max)
tDQSCK(max)
tDQSCK(max)
tRPST
tHZ(DQS)max
tRPRE
tQSH
tQSL
tQSH
tQSL
tQSH
tQSL
Bit 0 Bit 1
Bit 2
Bit 3
Bit 4 Bit 5
Bit 6
Bit 7
Notes:
1. Within a burst, rising strobe edge is not necessarily fixed to be always at tDQSCK(min) or tDQSCK(max). Instead, rising strobe
edge can vary between tDQSCK(min) and tDQSCK(max).
2. Not with standing note 1, a rising strobe edge with tDQSCK(max) at T(n) can not be immediately followed by a rising strobe
edge with tDQSCK(min) at T(n+1). This is because other timing relationships (tQSH, tQSL) exist:
if tDQSCK(n+1) < 0:
tDQSCK(n) < 1.0 tCK - (tQSHmin + tQSLmin) - | tDQSCK(n+1) |
3. The DQS, DQS# differential output high time is defined by tQSH and the DQS, DQS# differential output low time is defined by
tQSL.
4. Likewise, tLZ(DQS)min and tHZ(DQS)min are not tied to tDQSCK,min (early strobe case) and tLZ(DQS)max and tHZ(DQS)max
are not tied to tDQSCK,max (late strobe case).
5. The minimum pulse width of read preamble is defined by tRPRE(min).
6. The maximum read postamble is bound by tDQSCK(min) plus tQSH(min) on the left side and tHZDSQ(max) on the right side.
7. The minimum pulse width of read postamble is defined by tRPST(min).
8. The maximum read preamble is bound by tLZDQS(min) on the left side and tDQSCK(max) on the right side.
Figure 24 Clock to Data Strobe Relationship
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Publication Release Date: Feb. 27, 2013
Revision A04
 

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