Cirrus Logic CS4953xx User Manual
Page 87
8-9
Copyright 2010 Cirrus Logic, Inc.
DS732UM10
SDRAM/Flash Controller Interface
CS4953xx Hardware User’s Manual
§§
StaticWaitTurn0
(Not Supported)
Bus Turnaround Cycle Delay (t
xmturn
)
Bit 31:4 = 0 = Reserved
Bit 3:0 =SRAM_TURN_CYCLE, where:
0000 to 1110 = (n+1) HCLK cycle for bus Turnaround time.
t
xmturn
=(SRAM_TURN_CYCLE + 1)*HCLK
0x81000076
0xHHHHHHHH
Default 0x0000000F
StaticConfig1
Bit 31:2 = 0 = Reserved
Bit 1:0 = Memory Bus Width, where:
00 = Flash Memory bus 8 bits wide.
01 = Flash Memory bus 16 bits wide.
10 = Reserved
11 = Reserved
0x81000077
0xhHHHHHHH
Default 0x00000001
StaticWaitWen1
EXT_CS falling to EXT_WE falling (t
xmcswe
)
Bit 31:4 = 0 = Reserved
Bit 3:0 = Flash_WEN_CYCLE, where:
0000 = one DSP clk cycle between the assertion of chip select and write
enable. 0001 to 1111 = (n+1) cycle delay.
t
xmcswe
=(Flash_WEN_CYCLE + 1 )*HCLK
0x81000078
0XHHHHHHHH
Default 0x00000000
StaticWaitOen1
EXT_CS falling to EXT_OE falling (t
xmcsoe
)
Bit 31:4 = 0 = Reserved
Bit 3:0 =Flash_OEN_CYCLE, where:
0000 = no delay between the assertion of chip select and output enable.
0001 to 1111 = (n) cycle delay.
t
xmcsoe
=(Flash_OEN_CYCLE )*HCLK
0x81000079
0xHHHHHHHH
Default 0x00000000
StaticWaitRd1
Single Word Read Cycle (t
xmrdc
)
Bit 31:5 = 0 = Reserved
Bit 4:0 =Flash_RD_CYCLE, where:
00000 to 11110 = (n+1) HCLK cycle for Read Cycle.
t
xmrdc
=(Flash_RD_CYCLE + 1 )*HCLK - 6.87ns
0x8100007A
0xHHHHHHHH
Default 0x0000000A
StaticWaitWr1
EXT_CS falling to EXT_WE rising (t
xmcswa
)
Bit 31:5 = 0 = Reserved
Bit 4:0 =Flash_WR_CYCLE, where:
00000 to 11110 = (n+2) HCLK cycle for Write access time.
t
xmcswa
=(Flash_WR_CYCLE + 2)*HCLK
0x8100007C
0xHHHHHHHH
Default 0x00000007
StaticWaitTurn1
Bus Turnaround Cycle Delay (t
xmturn
)
Bit 31:4 = 0 = Reserved
Bit 3:0 =Flash_TURN_CYCLE, where:
0000 to 1110 = (n+1) HCLK cycle for bus Turnaround time.
t
xmturn
=(Flash_TURN_CYCLE + 1)*HCLK
0x8100007D
0xHHHHHHHH
Default 0x00000002
Table 8-2. SDRAM/Flash Controller Parameters (Continued)
Mnemonic
Hex Message