Zynq-7000 AP SoC and 7 Series FPGAs MIS v4.1 428
UG586 November 30, 2016
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Chapter 3: RLDRAM II and RLDRAM 3 Memory Interface Solutions
user_wr_en Input
Write Data Enable. This signal issues the write
data and data mask. It indicates that the
corresponding user_wr_* signals are valid.
user_wr_data[2 × nCK_PER_CLK × DATA_WIDTH – 1:0] Input
Write Data. This is the data to use for a write
request and is composed of the rise and fall
data concatenated together. It is valid when
user_wr_en is asserted.
user_wr_dm[2 × nCK_PER_CLK × DM_WIDTH – 1:0] Input
Write Data Mask. When active-High, the write
data for a given selected device is masked
and not written to the memory. It is valid
when user_wr_en is asserted.
user_afifo_empty Output
Address FIFO empty. If asserted, the
command buffer is empty.
user_wdfifo_empty Output
Write Data FIFO empty. If asserted, the write
data buffer is empty.
user_afifo_full Output
Address FIFO full. If asserted, the command
buffer is full, and any writes to the FIFO are
ignored until deasserted.
user_wdfifo_full Output
Write Data FIFO full. If asserted, the write
data buffer is full, and any writes to the FIFO
are ignored until deasserted.
user_afifo_aempty Output
Address FIFO almost empty. If asserted, the
command buffer is almost empty.
user_afifo_afull Output
Address FIFO almost full. If asserted, the
command buffer is almost full.
user_wdfifo_aempty Output
Write Data FIFO almost empty. If asserted,
the write data buffer is almost empty.
user_wdfifo_afull Output
Write Data FIFO almost full. If asserted, the
Write Data buffer is almost full.
user_rd_valid[nCK_PER_CLK – 1:0] Output
Read Valid. This signal indicates that data
read back from memory is available on
user_rd_data and should be sampled.
user_rd_data[2 × nCK_PER_CLK × DATA_WIDTH – 1:0] Output
Read Data. This is the data r ead b ack f rom t he
read command.
init_calib_complete Output
Calibration Done. This signal indicates back
to the user design that read calibration is
complete and requests can now take place.
mem_ck_lock_complete Output
Memory CK Lock Done. The system should be
kept in a quiet state until assertion of
mem_ck_lock_complete to ensure minimal
noise on the CK being driven to the memory.
Table 3-9: Client Interface Request Signals (Cont’d)
Signal Direction Description
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