Altera Embedded Peripherals IP User Manual
Page 36
Signal
Width
Direction
Description
tcm_request
1
Output
The meaning of
tcm_
request
depends on the
state of the
tcm_grant
signal, as the following rules
dictate:
• When
tcm_request
is
asserted and
tcm_grant
is
deasserted,
tcm_request
is requesting access for
the current cycle.
• When
tcm_request
is
asserted and
tcm_grant
is
asserted,
tcm_request
is
requesting access for the
next cycle; consequently,
tcm_request
should be
deasserted on the final
cycle of an access.
Because
tcm_request
is
deasserted in the last cycle of
a bus access, it can be
reasserted immediately
following the final cycle of a
transfer, making both
rearbitration and continuous
bus access possible if no
other masters are requesting
access.
Once asserted,
tcm_request
must remain asserted until
granted; consequently, the
shortest bus access is 2
cycles.
Valid only when pin-sharing
mode is enabled.
sdram_dq_width
sdram_data_width
Output
SDRAM data bus output.
Valid only when pin-sharing
mode is enabled
sdram_dq_in
sdram_data_width
Input
SDRAM data bus output.
Valid only when pin-sharing
mode is enabled.
3-6
Interface
UG-01085
2014.24.07
Altera Corporation
Tri-State SDRAM