Cypress FM4 Series - Bus Access Mode

CHAPTER 14: External Bus Interface
762 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
3.1 Bus Access Mode
The following explains bus access mode.
Access Method
The external bus interface allows selecting separate mode or multiplex mode with the register.
 Separate Mode
This mode outputs the address to the MAD[24:0] pins and inputs/outputs the data to the MADATA[31:0]
pins.
As the address pins and data pins are separated each other, connecting directly with the normal SRAM
and high speed accesses can be achieved. An example of waveform in separate mode is shown in Figure
3-1.
Figure 3-1 Example of Waveform in Separate Mode
RD
0 1 2 3 4 5 6 7 8 9
10
11 12
MADATA[31:0]
MOEX
MWEX
MDQM[0]
Read access cycle
MCSX
WD
Write access cycle
Address
MAD[24:16]
Address
Address
MAD[15:0]
Address
MCLKOUT