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/XLAST is used to determine the next status using ROCC. There - fore,
it must be
maintained by /NCK.
/XLAST changes due to ADCK,
so the period between the ADCK
leading edge and /NCK leading edge must be a minimum of 75 nsec
/YLAST is the concluding condition for ROCC, so it must be main- tained by /rclr.
/GENSCC must be maintained during shift setting (while QA is high).
/SELORl, 2 and /SELG, in order to switch addresses, must last a minimum of 40 nsec
to the trailing edges of /res and /cas for the FB and for a minimum of 300 nsec
until the leading edge of fc for the kanji ROM.
XINC is used by XSLM, XSRM, XERM, XELM, /PRO and /NWR, so it must be maintained for
35 nsec from the /ras trailing edge for regis - ter setting and at the leading edge
of /NCK.
XLATIN, /PRERM and /CLRERM are used by XERM and XELM, so they must be maintained for
35 nsec from the /ras trailing edge.
The address registers are set by the host (SDEST, SSOUR, and SLIMIT), but can be
changed by ADCK. For this reason,
/XINC,
/YINC,
/LMK,
WRITE,
COMO and 1 must be
maintained from the lead- ing to the trailing edge of ADCK.
3-56
NWS-1510/1530/1580
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