PSD211R datasheet(19/51 Pages) STMICROELECTRONICS

19 / 51 page

PSD211R Family

11.0

PSD Memory

The following sections explain the EPROM memory block and how to program and erase

the PSD211R.

11.1 EPROM

For all PSD211R devices, the EPROM is built using Zero-power technology. This means

that the EPROM powers up only when the address changes. It consumes power for the

necessary time to latch data on its outputs. After this, it powers down and remains in

standby mode until the next address change. This happens automatically, and the designer

has to do nothing special.

The 32K x 8 EPROM is divided into eight equal-sized banks. Each bank can be placed in

any address location by programming the PAD. Bank0-Bank7 are selected by PAD A

outputs ES0-ES7, respectively. There is one product term for each bank select (ESi).

11.2 Programming and Erasure

Programming the device can be done using the following methods:

• WSI’s main programmer—PSDpro—which is accessible through a parallel port.

• WSI’s programmer used specifically with the PSD211R—PEP300.

• WSI’s discontinued programmer—Magic Pro.

• A 3rd party programmer, such as Data I/O.

Information for programming the device is available directly from WSI. Please contact your

local sales representative. Also, check our web site (waferscale.com) for information related

to 3rd party programmers.

Upon delivery from WSI, or after each erasure (using windowed part), the PSD211R device

has all bits in the PAD and EPROM in the HI state (logic 1). The configuration bits are in the

LO state (logic 0).

To clear all locations of their programmed contents (assuming you have a windowed

version), expose the windowed device to an Ultra-Violet (UV) light source. A dosage of

30 W second/cm2 is required for PSD211R devices, and 40 W second/cm2 for low-voltage

(V suffix) devices. This dosage can be obtained with exposure to a wavelength of

2537 Å and intensity of 12000 µW/cm2 for 40 to 45 minutes for the PSD211R and 55 to 60

minutes for the low-voltage (V suffix) devices. The device should be approximately 1 inch

(2.54 cm) from the source, and all filters should be removed from the UV light source prior

to erasure.

The PSD211R devices will erase with light sources having wavelengths shorter than

4000 Å. However, the erasure times will be much longer than when using the

recommended 2537 Å wavelength. Note: exposure to sunlight will eventually erase the

device. If used in such an environment, the package window should be covered with an

opaque substance.

12.0

Control Signals

Consult your MCU data sheet to determine which control signals your MCU generates, and

how they operate. This section is intended to show which control signals should be

connected to what pins on the PSD211R. You will then use PSDsoft to configure the

PSD211R, based on the combination of control signals that your MCU outputs, for example

RD, WR, and PSEN.

The PSD211R is compatible with the following control signals:

• ALE or AS (polarity is programmable)

• WR or R/W

• RD/E

• PSEN

• A19/CSI

• RESET (polarity is programmable except on low voltage versions with the V suffix).

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