Zilog EZ80L92 - Manual (Page 53)

eZ80L92 Development Kit
User Manual
UM012913-0407 Operational Description
49
eZ80L92 Module Memory
The eZ80L92 Module contains 512 KB SRAM and 1 MB Flash memory.
This addressing structure provides 1 MB of contiguous SRAM for
immediate use.
SRAM Memory
The eZ80L92 Module features 512 KB of fast SRAM. Access speed is
typically 12 ns or faster, allowing zero-wait-state operation at 48 MHz.
With the CPU at 48 MHz, onboard SRAM can be accessed with zero wait
states in eZ80 mode. CS1_CTL (chip select CS1) can be set to
08h
(no
wait states).
Flash Memory
The Flash Boot Loader, application code, and user configuration data are
held permanently in Flash memory. As an example, for 128 KB onboard
SRAM, 1 MB of ROM is required.
Reset Generator
The onboard Reset Generator Chip is connected to the eZ80L92 Reset
input pin. It performs reliable Power-On Reset functions, generating a
reset pulse with a duration of 200 ms if the power supply drops below
2.93 V. This reset pulse ensures that the board always starts in a defined
condition. The RESET pin on the I/O connector reflects the status of the
RESET line. It is a bidirectional pin for resetting external peripheral com-
ponents or for resetting the eZ80L92 Development Kit with a low-imped-
ance output (for example, a 100-Ohm push button).
IrDA Transceiver
An onboard IrDA transceiver (ZiLOG ZHX1810) is connected to PD0
(TX), PD1 (RX), and PD2 (Shutdown, IR_SD). The IrDA transceiver is
of the LED type 870 nm Class 1.