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Altera_Forum
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21 years ago

Address Exception

Hi We are using a SRAM that has a 16-bit wide data bus and /BLE and /BHE signals for byte-write. Writing bytes to addresses 0 to 7 works, with BLE and BHE behaving as expected, although A0...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

is your wiring correct ?

i use ISSI IS61LV25616AL 256k x 16

wiring: NIOS [A18..A1] -> SRAM [A17..A0]

userlogic is setup as following:

Bus Interface Type: Avalon Memory Slave

PORT NAME | Width | Direction | Shared | Type

address | 18 | input | yes | address

write_n | 1 | input | yes | write_n

read_n | 1 | input | yes | read_n

writedata | 16 | inout | yes | data

chipselect_n | 1 | input | --- | chipselect_n

be_n | 2 | input | yes | byteenable_n

system clock frequency is 50 Mhz

i use 1 setup, 1 wait, 1 wait cycle