EFM32WG Datasheet, PDF (192/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

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Figure 14.30. EBI NAND Flash Data Output Timing
RDSETUP
(0, 1, 2, ...)
EBI_AD[ 7:0] = NAND IO
Z
t _CEA
GPIO or EBI_CSn = NAND CEn
EBI_NANDWEn = NAND REn
t _RR
GPIO = NAND R/B
RDSTRB
(1, 2, 3, ...)
t _REA
RDHOLD
(0, 1, 2, ...)
t _RHZ
t _RHOH
DATA OUT
Z
t _RC
t _RP
t _REH
The EBI_RDTIMING(n) setting requirements for satisfying the NAND Flash timing parameters for data
output timing are shown in Table 14.6 (p. 192) .
Table 14.6. EBI NAND Flash Read Timing
NAND Read Timing Parameter
tCEA
tREA
tRP
tRHZ
tREH
tRC
tRR
tAR
tCLR
tIR
EBI Read Timing Parameter Requirements
<= t(RDSETUP) + t(RDSTRB)
<= t(RDSTRB)
<= t(RDSTRB)
<= t(RDHOLD)
<= t(RDHOLD) + t(RDSETUP)
<= t(RDHOLD) + t(RDSETUP) + t(RDSTRB)
<= t(RDSETUP) (assuming software wait for R/B high)
<= t(RDSETUP)
<= t(RDSETUP)
<= t(RDSETUP)
The NAND Flash timing parameters tWHR and tRHW define separation of read and write pulses and
therefore they can be satisfied by a combination of EBI_RDTIMING(n) and EBI_WRTIMING(n) settings
as shown in Table 14.7 (p. 192) .
Table 14.7. EBI NAND Flash Read/Write Timing Requirements
NAND Timing Parameter
tWHR
tRHW
EBI Timing Parameter
<= t(WRHOLD) + t(RDSETUP)
<= t(RDHOLD) + t(WRSETUP)
Remaining NAND Flash timing parameters, e.g. tRST and tPROG, should be dealt with in software.
14.3.14.3 Application examples
A typical 528-byte page read sequence for an 8-bit wide NAND Flash is as follows:
• Configuration: Enable and select the memory bank connected to the NAND Flash device via the
EN and BANKSEL bitfields in the EBI_NANDCTRL register. Set the MODE field of the EBI_CTRL
register to D8A8 indicating that the attached device is 8-bit wide. Program the EBI_RDTIMING and
EBI_WRTIMING registers to fulfill the NAND timing requirements.
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
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