クリティカルな問題
Starting in the 11.0 software release version of the CPRI
IP core, the tx_ex_buf_delay_valid and rx_ex_buf_delay_valid fields
of the CPRI_EX_DELAY_STATUS register (at offset 0x40)
are combined in a single ex_buf_delay_valid field.
The tx_ex_buf_delay field and the rx_ex_buf_delay field
are updated at the same time, and therefore, a single ex_buf_delay_valid field indicates
when their values are valid. The new ex_buf_delay_valid register
field is at bit [16] of the CPRI_EX_DELAY_STATUS register,
and bit [31] is now Reserved.
However, some versions of the CPRI
MegaCore Function User Guide document the tx_ex_buf_delay_valid and rx_ex_buf_delay_valid fields
of the CPRI_EX_DELAY_STATUS register (at offset 0x40)
as they were in earlier versions of the IP core.
Do not refer to bit [31] of the CPRI_EX_DELAY_STATUS register
in CPRI IP core versions 11.0 and later. Bit [16] provides the functionality
that bit [31] provided in earlier versions of the IP core.
この問題は、CPRI のバージョン 12.1 SP1 で修正されています。 MegaCore ファンクション・ユーザーガイド