CC2640R2F: ble协议栈中用户可使用的NV一次最多可以写入多少字节？

在osal_snv.h中定义了读写nv的函数，但函数中未说明一次可写入读取的字节数限制。请问每个NV id对应的flash可保存的字节是多少？谢谢大佬~

/*********************************************************************
 * @fn      osal_snv_read
 *
 * @brief   Read data from NV.
 *
 * @param   id   - Valid NV item Id.
 * @param   len  - Length of data to read.
 * @param   *pBuf - Data is read into this buffer.
 *
 * @return  SUCCESS if successful.
 *          Otherwise, NV_OPER_FAILED for failure.
 */
extern uint8 osal_snv_read( osalSnvId_t id, osalSnvLen_t len, void *pBuf);

/*********************************************************************
 * @fn      osal_snv_write
 *
 * @brief   Write a data item to NV.
 *
 * @param   id   - Valid NV item Id.
 * @param   len  - Length of data to write.
 * @param   *pBuf - Data to write.
 *
 * @return  SUCCESS if successful, NV_OPER_FAILED if failed.
 */
extern uint8 osal_snv_write( osalSnvId_t id, osalSnvLen_t len, void *pBuf);