mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 212

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

SDRAM Interface
9.10.2 SDRAM Write Accesses
Like the read operations, shown in Figure 9-9 and Figure 9-10, the write operations require
one cycle to issue the address (T1) and another (T2) to determine whether the access is page
hit or miss. In the burst-write, page-miss example, shown in Figure 9-11, after the SDRAM
determines that this is a page miss (T2), the precharge old page (T3) and activate new page
cycles (T5) are required. Cycle T6 is a wait state for SDRAM activation command as it is
in Figure 9-9.
9-18
A10_PRECHG
Figure 9-10. SDRAM Burst Read, 32-Bit Port, Page Hit, Access = 5-1-1-1
SDADR[13:0]
SDBA[1:0]
SDCLKE
SDCLK
BS[3:0]
D[31:0]
SDWE
SDCS
RAS0
CAS0
T0
CF2 Core
T1
Address
Issue
T2
Miss?
Hit or
Page
MCF5272 User’s Manual
T3
Read
1
Col
T4
Read
Col
2
Bank
T5
Read
Data
3
Col
T6
Read
Data
Col
4
T7
Data
T8
Data
MOTOROLA
T9