Altera Embedded Peripherals IP Instrukcja Użytkownika Strona 36

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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
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