KM416RD8AS-RBM80 datasheet(50/64 Pages) SAMSUNG

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Page 47

KM416RD8AS

Direct RDRAM™

Rev. 0.9 July 1999

Target

RSL - Clocking

Figure 53 is a timing diagram which shows the detailed

requirements for the RSL clock signals on the Channel.

The CTM and CTMN are differential clock inputs used for

transmitting information on the DQA and DQB, outputs.

Most timing is measured relative to the points where they

cross. The tCYCLE parameter is measured from the falling

CTM edge to the falling CTM edge. The tCL and tCH param-

eters are measured from falling to rising and rising to falling

edges of CTM. The tCR and tCF rise- and fall-time parame-

ters are measured at the 20% and 80% points.

The CFM and CFMN are differential clock outputs used for

receiving information on the DQA, DQB, ROW and COL

outputs. Most timing is measured relative to the points

where they cross. The tCYCLE parameter is measured from

the falling CFM edge to the falling CFM edge. The tCL and

tCH parameters are measured from falling to rising and rising

to falling edges of CFM. The tCR and tCF rise- and fall-time

parameters are measured at the 20% and 80% points.

The tTR parameter specifies the phase difference that may be

tolerated with respect to the CTM and CFM differential

clock inputs (the CTM pair is always earlier).

Figure 53: RSL Timing - Clock Signals

VCIH

50%

VCIL

80%

20%

CTM

CTMN

VCIH

50%

VCIL

80%

20%

CFM

CFMN

tTR

tCF

tCR

tCYCLE

tCL

tCH

tCF

tCR

tCYCLE

tCL

tCH

VCM

VX+

VX-

VCM

VX+

VX-

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