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W631GG6KB
8.13.2.3 t LZ(DQS) , t LZ(DQ) , t HZ(DQS) , t HZ(DQ) Calculation
t HZ and t LZ transitions occur in the same time window as valid data transitions. These parameters are
referenced to a specific voltage level that specifies when the device output is no longer driving t HZ(DQS)
and t HZ(DQ) , or begins driving t LZ(DQS) , t LZ(DQ) . Figure 26 shows a method to calculate the point when
the device is no longer driving t HZ(DQS) and t HZ(DQ) , or begins driving t LZ(DQS) , t LZ(DQ) , by measuring
the signal at two different voltages. The actual voltage measurement points are not critical as long as
the calculation is consistent. The parameters t LZ(DQS) , t LZ(DQ) , t HZ(DQS) , and t HZ(DQ) are defined as
singled ended.
t LZ(DQS) : CK – CK# rising crossing at RL - 1
t LZ(DQ) : CK – CK# rising crossing at RL
CK
CK#
t LZ
V TT + 2x mV
V TT + x mV
t LZ(DQS) , t LZ(DQ)
t HZ(DQS) , t HZ(DQ) with BL8: CK – CK# rising crossing at RL + 4 nCK
t HZ(DQS) , t HZ(DQ) with BC4: CK – CK# rising crossing at RL + 2 nCK
CK
CK#
t HZ
V OH - x mV
V OH - 2x mV
t HZ(DQS) , t HZ(DQ)
V TT - x mV
V TT - 2x mV
T1
T2
T1
T2
V OL + 2x mV
V OL + x mV
t LZ(DQS) , t LZ(DQ) begin point = 2 * T1 - T2
t HZ(DQS) , t HZ(DQ) end point = 2 * T1 - T2
Figure 26 – t LZ and t HZ method for calculating transitions and endpoints
Publication Release Date: Dec. 09, 2013
Revision A05
- 47 -
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