Signals on the interface to the i2c master, Signals on the interface to the i, C master -9 – Altera Hybrid Memory Cube Controller User Manual
Page 46: C master
Related Information
The HMC specification is available for download from the Hybrid Memory Cube Consortium web page.
Signals on the Interface to the I
2
C Master
Your design must include an I
2
C master module that drives the HMC device I
2
C interface for link
initialization. This interface connects to the I
2
C module.
The I
2
C module and the IP core together must implement the following four-way handshake with the two
interface signals:
1. Resetting the IP core deasserts the
i2c_load_registers
signal. Resetting the I
2
C master module
should deassert the
i2c_registers_loaded
signal.
2. When the IP core and the HMC are ready, the IP core asserts
i2c_load_registers
. In simulation, the
IP core assumes the HMC simulation model is ready instantaneously, and in hardware, the IP core
waits the required t
INIT
duration of 20 ms.
3. After the I
2
C master module detects the assertion of
i2c_load_registers
, it writes to the HMC
device registers to set them up for link initialization (concluding with
Init Continue
) and then
asserts the
i2c_registers_loaded
signal.
4. The HMC Controller IP core deasserts
i2c_load_registers
.
5. The I
2
C master module deasserts
i2c_registers_loaded
.
Table 4-4: Signals on the Interface to the External I
2
C Master Module
The IP core
i2c_load_registers
signal behavior conforms to the four-way handshaking protocol. For correct
HMC Controller IP core functionality, you must design the I
2
C master module in your design to implement
i2c_registers_loaded
signal behavior that conforms to this four-way handshaking protocol.
Signal Name
Direction
Description
i2c_load_registers
Output
Indicates the HMC Controller IP core is ready for the
external I
2
C master module to load the HMC device
configuration registers, as part of the link initialization
sequence.
You must connect this signal to the I
2
C master module
input port that accepts requests to load the configuration
registers of the HMC device.
i2c_registers_loaded
Input
Indicates the external HMC device registers are
configured.
You must connect this signal to the output port of the I
2
C
master that indicates successful completion of the configu‐
ration register load sequence.
If multiple HMC Controller IP cores are connected to different links of the same HMC device, the
external I
2
C master must wait until all of the HMC Controller IP cores have asserted their
i2c_load_registers
signal, before writing to the HMC device configuration registers. After the external
I
2
C master completes writing all of the HMC configuration registers, it must assert the
i2c_registers_loaded
signals for all of the HMC Controller IP cores simultaneously.
UG-01152
2015.05.04
Signals on the Interface to the I
2
C Master
4-9
HMC Controller IP Core Signals
Altera Corporation