Digi NS9215 Computer Hardware User Manual


 
. . . . .
MEMORY CONTROLLER
Static Memory Write Delay 0–3 registers
www.digiembedded.com 257
modified during system initialization, or when there are no current or outstanding
transactions. Wait until the memory controller is idle, then enter low-power or
disabled mode.
Register
Register bit
assignment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Static Memory Write Delay 0–3 registers
Address: A070 0214 / 0234 / 0254 / 0274
The Static Memory Write Delay 0–3 registers allow you to program the delay from
the chip select to the write access. These registers control the overall period for
the write cycle. It is recommended that these registers be modified during system
initialization, or when there are no current or outstanding transactions. Wait until
the memory controller is idle, then enter low-power or disabled mode.These
registers are not used if the extended wait bit is enabled in the related Static
Memory Configuration register.
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
Reserved
Reserved WTPG
Bits Access Mnemonic Description
D31:05 N/A Reserved N/A (do not modify)
D04:00 R/W WTPG Asynchronous page mode read after the first wait state
(WAITPAGE)
00000–11110 (n+1)
clk_out cycle for read access time. For
asynchronous page mode read for sequential reads, the wait
state time for page mode accesses after the first read is
(WAITPAGE+1) x t
clk_out
11111 32 clk_out cycles read access time (reset value on reset_n)
Number of wait states for asynchronous page mode read accesses
after the first read.