17.2.4 Read (Read) Command

The READ command instructs the PE to read from memory. The number of 32-bit words specified in the operand field starting from the 32-bit address specified by the Addr_Low and Addr_High fields. This command can be used to read Flash memory and Configuration Words. All data returned in response to this command uses the packed data format that is provided in Table 17-5.

Figure 17-5. Read (Read) Command
Table 17-5. Read Format
FieldDescription
Op code0x1
OperandN number of 32-bit words to read (maximum of 65,535)
Addr_LowLow16 bits of 32-bit source address
Addr_HighHigh16 bits of 32-bit source address
Expected Response:
Figure 17-6. Read (Read) Response
Note: Reading unimplemented memory will cause the PE to Reset. Ensure that only memory locations present on a particular device are accessed.