ST STM32F40 Series Reference Manual page 1370

RM0090
Bits 15:8 ATTWAITx: Attribute memory x wait time
Defines the minimum number of HCLK (+1) clock cycles to assert the command (NWE,
NOE), for PC Card/NAND Flash read or write access to attribute memory space on socket x.
The duration for command assertion is extended if the wait signal (NWAIT) is active (low) at
the end of the programmed value of HCLK:
0000 0000: reserved
0000 0001: 2 HCLK cycles (+ wait cycle introduced by deassertion of NWAIT)
1111 1111: 256 HCLK cycles (+ wait cycle introduced by the card deasserting NWAIT)
(default value after reset)
Bits 7:0 ATTSETx: Attribute memory x setup time
Defines the number of HCLK (+1) clock cycles to set up address before the command
assertion (NWE, NOE), for PC CARD/NAND Flash read or write access to attribute memory
space on socket x:
0000 0000: 1 HCLK cycle
1111 1111: 256 HCLK cycles (default value after reset)
I/O space timing register 4 (FSMC_PIO4)
Address offset: 0xA000 0000 + 0xB0
Reset value: 0xFCFCFCFC
The FSMC_PIO4 read/write registers contain the timing information used to gain access to
the I/O space of the 16-bit PC Card/CompactFlash.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
IOHIZx
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:24 IOHIZx: I/O x databus HiZ time
Defines the number of HCLK clock cycles during which the databus is kept in HiZ after the
start of a PC Card write access to I/O space on socket x. Only valid for write transaction:
0000 0000: 0 HCLK cycle
1111 1111: 255 HCLK cycles (default value after reset)
IOHOLDx
Doc ID 018909 Rev 4
Flexible static memory controller (FSMC)
9 8 7
IOWAITx
6 5 4 3 2 1 0
IOSETx
1370/1422