Altera Hybrid Memory Cube Controller - Manual (Page 43)

Signal Name Direction Description
dp_rsp_size[2:0] Output Indicates the size of the payload associated with this
response. If the current response is a Read response,
indicates the size of the payload in
dp_rsp_data
.
During a response with an associated payload, the IP core
sets this signal to one of the following valid values:
• 3'b000 indicates a 16-byte payload or a Write response.
• 3'b001 indicates a 32-byte payload.
• 3'b010 indicates a 48-byte payload (half-width IP cores
only).
• 3'b011 indicates a 64-byte payload.
• 3'b100 indicates a 80-byte payload (half-width IP cores
only).
• 3'b101 indicates a 96-byte payload (half-width IP cores
only).
• 3'b110 indicates a 112-byte payload (half-width IP
cores only).
• 3'b111 indicates a 128-byte payload.
During a response with no associated payload, the value of
this signal is undefined. Responses with no associated
payload are the responses for which
dp_rsp_cmd[0]
has
the value of 1.
The IP core maintains the value of this signal for the
duration of a multi-cycle read data transfer.
dp_rsp_data[511:0]
(for full-
width IP cores)
dp_rsp_data[255:0]
(for half-
width IP cores)
Output Read response data.
During a response with no associated payload, the value of
this signal is undefined. Responses with no associated
payload are the responses for which
dp_rsp_cmd[0]
has
the value of 1.
If the size of the payload is not an integer multiple of the
data bus width, then in the final data transfer cycle, the IP
core transfers the remaining read payload in the least
significant bytes of
dp_rsp_data
. For example, the IP
core:
• Transfers a 16-byte payload in
dp_rsp_data[127:0]
.
• Transfers a 32-byte payload (from a full-width or half-
width IP core) in
dp_rsp_data[255:0]
.
• Transfers the final (most significant) 16 bytes of a 112-
byte payload from a half-width IP core in
dp_rsp_
data[127:0]
in the fourth data transfer clock cycle.
4-6 Application Response Interface
UG-01152
2015.05.04
Altera Corporation HMC Controller IP Core Signals
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