S3C2440A RISC MICROPROCESSOR ELECTRICAL DATA
27-37
Table 27-8 ROM/SRAM Bus Timing Constants
(VDDi, VDDalive, VDDiarm = 1.2 V ± 0.1 V, TA = -40 to 85 °C, VDDMOP = 3.3V ± 0.3V / 3.0V ± 0.3V / 2.5V ± 0.2V / 1.8V
± 0.1V)
Parameter Symbol Min
(VDDMOP =
3.3V/3.0V/2.5V/1.8V) Typ Max
(VDDMOP =
3.3V/3.0V/2.5V/1.8V) Unit
ROM/SRAM Address Delay tRAD 2 / 2 / 2 / 3 6 / 6 / 7 / 8 ns
ROM/SRAM Chip Select Delay tRCD 2 / 2 / 3 / 3 6 / 6 / 6 / 7 ns
ROM/SRAM Output Enable Delay tROD 2 / 2 / 2 / 3 5 / 5 / 5 / 6 ns
ROM/SRAM Read Data Setup Time. tRDS 1 / 1 / 1 / 2 – / – / – / – ns
ROM/SRAM Read Data Hold Time. tRDH 0 / 0 / 0 / 0 – / – / – / – ns
ROM/SRAM Byte Enable Delay tRBED 2 / 2 / 2 / 3 5 / 5 / 5 / 7 ns
ROM/SRAM Write Byte Enable Delay tRWBED 2 / 2 / 2 / 3 5 / 5 / 6 / 7 ns
ROM/SRAM Output Data Delay tRDD 2 / 2 / 2 / 2 6 / 6 / 6 / 7 ns
ROM/SRAM External Wait Setup Time tWS 3 / 3 / 4 / 4 – / – / – / – ns
ROM/SRAM External Wait Hold Time tWH 0 / 0 / 0 / 0 – / – / – / – ns
ROM/SRAM Write Enable Delay tRW D 2 / 2 / 2 / 3 5 / 5 / 6 / 7 ns
Table 27-9 Memory Interface Timing Constants
(VDDi, VDDalive, VDDiarm = 1.2 V ± 0.1 V, TA = -40 to 85 °C, VDDMOP = 3.3V ± 0.3V / 3.0V ± 0.3V / 2.5V ± 0.2V / 1.8V
± 0.1V)
Parameter Symbol Min Typ Max Unit
SDRAM Address Delay tSAD 1 – 4 ns
SDRAM Chip Select Delay tSCSD 1 – 3 ns
SDRAM Row Active Delay tSRD 1 – 3 ns
SDRAM Column Active Delay tSCD 1 – 3 ns
SDRAM Byte Enable Delay tSBED 1 – 3 ns
SDRAM Write Enable Delay tSW D 1 – 2 ns
SDRAM Read Data Setup Time tSDS 2 / 3 / 3 / 5 * ns
SDRAM Read Data Hold Time tSDH 0 – ns
SDRAM Output Data Delay tSDD 1 – 4 ns
SDRAM Clock Enable Delay Tcked 2 – 3 ns
NOTE: Minimum tSDS = 2ns / 3ns / 3ns, when VDDMOP = 3.3V / 3.0V / 2.5V / 1.8V respectively.