STMicroelectronics STM32F405 Reference Manual page 1646

Flexible memory controller (FMC)
Bits 15:8 MEMWAIT[7:0]: Common 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 common memory space on socket x. The
duration of command assertion is extended if the wait signal (NWAIT) is active (low) at the end
of the programmed value of HCLK:
Bits 7:0 MEMSET[7:0]: Common memory x setup time
Defines the number of HCLK (+1) clock cycles to set up the address before the command
assertion (NWE, NOE), for PC Card/NAND Flash read or write access to common memory
space on socket x:
Attribute memory space timing registers 2..4 (FMC_PATT2..4)
Address offset: 0x4C + 0x20 * (x – 1), x = 2..4
Reset value: 0xFCFC FCFC
Each FMC_PATTx (x = 2..4) read/write register contains the timing information for PC
Card/CompactFlash or NAND Flash memory bank x. It is used for 8-bit accesses to the
attribute memory space of the PC Card/CompactFlash or to access the NAND Flash for the
last address write access if the timing must differ from that of previous accesses (for
Ready/Busy management, refer to
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
ATTHIZ[7:0]
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 ATTHIZ[7:0]: Attribute memory x data bus Hi-Z time
Defines the number of HCLK clock cycles during which the data bus is kept in Hi-Z after the
start of a PC CARD/NAND Flash write access to attribute memory space on socket x. Only
valid for write transaction:
Bits 23:16 ATTHOLD[7:0]: Attribute memory x hold time
Defines the number of HCLK clock cycles during which the address is held (and data for write
access) after the command deassertion (NWE, NOE), for PC Card/NAND Flash read or write
access to attribute memory space on socket x
1646/1731
0000 0000: reserved
0000 0001: 2 HCLK cycles (+ wait cycle introduced by deasserting NWAIT)
1111 1110: 255 HCLK cycles (+ wait cycle introduced by deasserting NWAIT)
1111 1111: Reserved
0000 0000: 1 HCLK cycle
1111 1110: 255 HCLK cycles
1111 1111: Reserved.
ATTHOLD[7:0]
0000 0000: 0 HCLK cycle
1111 1110: 255 HCLK cycles
1111 1111: Reserved.
0000 0000: Reserved
0000 0001: 1 HCLK cycle
1111 1110: 254 HCLK cycles
1111 1111: Reserved.
DocID018909 Rev 11
Section 37.6.5: NAND Flash prewait
ATTWAIT[7:0]
functionality).
9 8 7 6 5 4 3
ATTSET[7:0]
RM0090
2 1 0