Xilinx HDMI 1.4, Product Manual

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HDMI 1.4/2.0 TX Subsystem 32
PG235 October 4, 2017 www.xilinx.com
Chapter 2: Product Specification
For the HDCP 1.4 transmitter, an HDCP Key Management module is needed, which is able to
send keys over the AXI4-Stream interface to the HDCP 1.4 controller. Figure 2-19 shows an
example of how the HDMI TX Subsystem is connected to the HDCP Key Management
module through a Key Management Bus (AXI4-Stream). The HDCP Key Management
module is not part of the HDMI TX Subsystem. For HDCP 1.4 design details, see the HDCP
v1.4 Product Guide (PG224) [Ref 26] .
However, the HDCP 2.2 key is handled slightly differently as it is solely controlled by the
software application. The user application is responsible for providing the infrastructure to
securely store and retrieve the keys to be loaded into the HDCP 2.2 drivers. For the detailed
list of keys that are required to be loaded by the user application, see the HDCP v2.2
Product Guide (PG249) [Ref 25] .
HDCP 2.2 Interrupt Outputs
Table 2-9 shows the signals for HDCP 2.2 interrupt output ports.
hdcp14_key_aclk Output 1 AXI4-Stream clock
hdcp14_key_aresetn Output 1 Reset (Active-Low)
hdcp14_start_key_transmit Output 1 Start key transmit
hdcp14_reg_key_sel Output 3 Key select
Table 2 ‐ 8: HDCP 1.4 Key Input Interface (Cont’d)
Name Direction Width Description
X-Ref Target - Figure 2-19
Figure 2 ‐ 19: HDCP 1.4 Key Management Bus (AXI4-Stream)
HDMI TX Subsystem
Key Management Bus
(AXI4-Stream)
HDCP Key
Management
HDMI TX
HDCP 1.4
Controller
• • • • • • •• • • • • • •
Table 2 ‐ 9: HDCP 2.2 Interrupt Output Interface
Name Direction Width Description
hdcp22_irq Output 1 HDCP 2.2 interrupt
hdcp22_timer_irq Output 1 HDCP 2.2 timer interrupt
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