ELECTRICAL DATA S3C2440A RISC MICROPROCESSOR
27-36
Table 27-7 Clock Timing Constants
(VDDi, VDDalive, VDDiarm = 1.2 V ± 0.1 V, TA = -40 to 85 °C, VDDMOP = 3.3V ± 0.3V)
Parameter Symbol Min Typ Max Unit
Crystal clock input frequency fXTAL 12 – 20 MHz
Crystal clock input cycle time tXTA LCYC 50 – 83.3 ns
External clock input frequency fEXT – – 66 MHz
External clock input cycle time tEXTCYC 15.0 – ns
External clock input low level pulse width tEXTLOW 7 – – ns
External clock to HCLK (without PLL) tEX2HC 3 – 7 ns
HCLK (internal) to CLKOUT tHC2CK 3 – 9 ns
HCLK (internal) to SCLK tHC2SCLK 1 – 2 ns
External clock input high level pulse width tEXTHIGH 4 – – ns
Reset assert time after clock stabilization tRESW 4 – –
XTIpll or
EXTCLK
PLL Lock Time tPLL 300 – µS
Sleep mode return oscillation setting time tOSC2 – – 65536
XTIpll or
EXTCLK
Interval before CPU runs after nRESET is released tRST2RUN – 7 –
XTIpll or
EXTCLK