AT91SAM9260 загрузка с внешней флешки Опции

[MegaFPGA]

Необходимо загрузиться с внешней флешки. следуя датащиту:
REMAP = 0
BMS = 0
При включении должна начаться загрузка с нулевого CS.

BMS = 0, Boot on External Memory
• Boot on slow clock (On-chip RC or 32,768 Hz)
• Boot with the default configuration for the Static Memory Controller, byte select mode, 16-bit
data bus, Read/Write controlled by Chip Select, allows boot on 16-bit non-volatile memory.
The customer-programmed software must perform a complete configuration.
To speed up the boot sequence when booting at 32 kHz EBI CS0 (BMS=0), the user must take
the following steps:
1. Program the PMC (main oscillator enable or bypass mode).
2. Program and start the PLL.
3. Reprogram the SMC setup, cycle, hold, mode timings registers for CS0 to adapt them
to the new clock.
4. Switch the main clock to the new value.

Что значит Read/Write controlled by Chip Select ? Что сигнал NRD не используется при чтении ?